Resolve issue: https://github.com/kanaka/noVNC/pull/101

Based on proposal from @mightpenguin:
Matthew Balman <emperor@mightypenguin.org>

If view_only option is set then do not send mouse and keyboard events.
This is not a secure/enforced way to make a client view only. To
enforce view only at the server, most VNC servers support setting
a view only password.

Opera presto engine version detection is broken. For now, just return
true or false. That should cover most cases.

libvncserver now includes noVNC as an alternative to the Java web
client.

Thanks Alex Bligh for the catch.

Pull websockify 724aa3a.

- Use array module for unmasking HyBi when no numpy module is
    available.

- Detect client close properly when using python 3.

- Print request URL path is specified.

- New option --run-once will exit after handling a single WebSocket
  connection (but not ater flash policy or normal web requests).

- New option --timeout TIME will stop listening for new connections
  after exit after TIME seconds (the master process shuts down).
  Existing WebSocket connections will continue but once all
  connections are closed all processes will terminate.

- Remove the images using the old font.

- Simplify the naming of the new control bar icon images.

- Change keyboard input type to 'email'. 'url' type doesn't have
  a space bar.

- Some clarifications to main LICENSE.txt file.

- CSS highlighting of buttons when selected.
- Keyboard button tweaked to allow show/hide toggle of keyboard.
Signed-off-by: Chris Gordon <snorkeyg@gmail.com>

- Add Orbitron info to LICENSE.txt

- Update TODO.

Instead of using Google Font API, use local copy of Orbitron for speed
and also in case Internet connection is flaky or unavailable.

More info about Orbitron font here:
http://www.google.com/webfonts/specimen/Orbitron

Orbitron font is:
Copyright (c) 2009, Matt McInerney <matt@pixelspread.com>

Licensed under SIL Open Font License 1.1
see docs/LICENSE.OFL-1.1 or http://scripts.sil.org/OFL

Also, add path option settable with query string.

Move viewportChange(), getCleanDirtyReset(), absX() and absY() to the
public API section. Also add some function comments.

Display API change:
    - getTile -> startTile (no longer returns a tile)
    - setSubTile -> subTile (drop img/tile first parameter)
    - putTile -> finishTile (no longer takes img/tile paramter)

The Display tile logic uses canvas image data directly and
caches/reuses a 16x16 imageData tile (for other sizes, the tile is
create for each call). This gives a 30% speedup on Chrome
13 (and no significant change for Firefox 3.6/4.0).

Other:

- Remove rgbxImageFill and cmapImageFill routines.

- Simplify constructor tests and just error if createImageData is not
  supported by canvas instead of .

- Remove webkit canvas bug workaround that effects Chrome 7. Chrome
  7 usage share is now less than 0.5 percent and the workaround is
  ugly. Drop the function wrapping in the constructor and the canvas
  flush() routine.

- Remove support for getImageData (Opera 11+ now required)

Update browser support list:

    - Chrome 8+ (really any except 7)
    - Firefox 3.6+
    - Safari 4+
    - Opera 11+
    - IE9+
    - iOS 4.2+

- Make sure that on iOS the clipping setting is always forced to be
  enabled.
- Hide the showKeyboard button unless connected.
- Use the URL text entry method and disable autocorrect and
  autocapitalize in the show keyboard input box.

Cleanup:

- remove unused changeViewportMeta function from include/ui.js
- remove some debug output and debug CSS.
- rename panel toggle functions and put them in same location in the
  code.
- refactor some code from updateState to updateVisualState routine
  (renamed from updateSettingsState).

API changes (forward compatible):

- Display: add 'viewport' conf option to turn on and off viewport
  mode.
- RFB: add 'viewportDrag' option to enable/disable viewport dragging
  mode.

Other:

- Add clip mode setting to default UI. For touch devices, clipping is
  forced on.
- Use CSS media queries to adjust visual elements based on screen
  size. Especially disconnected logo size/position and button text size.
- Catch page unload while connected and give a confirm dialog.
- Change mouse button selector to a single button that changes between
  ' ', 'L', 'M', 'R' when clicked (empty means mouse is just being
  moved and doesn't send clicks).
- include/ui.js:setViewClip() routine sets the clipping of the
  viewport to the current size of the viewport area (if clipping is
  enabled).
- include/ui.js:setViewDrag() toggles/enables/disables viewport
  dragging mode.
- Add several images for the UI and for Apple devices:
    - images/clipboard.png: clipboard menu icon
    - images/connect.png: connect menu icon
    - images/disconnect.png: disconnect button icon
    - images/keyboard.png: show keyboard button
    - images/move.png: viewport drag/move toggle button
    - images/settings.png: settings menu icon
    - images/screen_320x460.png: iOS app/desktop link start image
    - images/screen_57x57.png: iOS app icon
    - images/screen_700x700.png: full size noVNC image

New routine fbUpdateRequests that builds the update request messages
based on the result of display.getCleanDirtyReset().

- Also, fix fbUpdateRequest to properly accept x,y,xw,yw parameters.

Another firefox issue is that height: 100% is calculated as 100% of
the containing element even when the containing element is the window.
This means that the size of any sibling element shifts the window size
down by that much and causes the vertical scroll bars to appear. This
doesn't happen in Chrome.

- So instead, put a pad element inside the noVNC_screen element that
  is the size of the control bar. This is hidden by the control bar,
  however, it causes things to be sized correctly.

- Also, rename noVNC_defaultScreen to noVNC_logo.

- Clean some style specification out of the HTML.

For some reason, the position calculation is broken in firefox when
a DOM object in the ancestry change uses padding. So use margin to
shift the view area down.

Conflicts:
	include/rfb.js

Part of mobile device support:
https://github.com/kanaka/noVNC/issues/48

The Display object is redefined as a larger display region with
an equal or smaller visible viewport. The size of the full display
region is set/changed using resize(). The viewport is set/changed
using viewportChange().

All exposed routines that draw on the display now take coordinates
that are absolute (relative to the full display region). For example,
the result of fillRect(100, 100, 10, 10, [255,0,0]) will appear in the
canvas at (0,0) if the viewport is set to (100,100).

Details:

- Move the generic part of the viewport code from tests/viewport.html
  into include/display.

- Add two new routines to the Display interface:

    - viewportChange(deltaX, deltaY, width, height)
        - This adjusts the position of the visible viewport and/or the
          size of the viewport.

        - deltaX and deltaY specify how the position of the viewport
          should be shifted. The position of the viewport is clamped
          to the full region size (i.e. cannot outside the display
          region).

        - The clean and dirty regions of the display are updated based
          on calls to this routine. For example, if the viewport width
          is increased, then there is now a dirty box on the right
          side of the viewport. Another example, if the viewport is
          shifted down and to the left over the display region, there
          are now two dirty boxes: one on the left side and one
          on the bottom of the viewport.

    - getCleanDirtyReset()
        - This returns an object with the clean box and a list of
          dirty boxes (that need to be redrawn).

            {'cleanBox':
                {'x': x, 'y': y, 'w': w, 'h': h},
             'dirtyBoxes':
                [{'x': x, 'y': y, 'w': w, 'h': h}, ...]
             }

        - The coordinates in the clean and dirty boxes are absolute
          coordinates (relative to the full display region) but they
          are clipped to the visible viewport.

        - Calling this function also resets the clean rectangle to be
          the whole viewport (i.e. nothing visible needs to be redrawn
          dirty) so the caller of this routine is responsible for
          redrawing any

Pull from websockify 1c39c7f1f001.

- 4 space indenting for HTML and Javascript.
- 2 space indenting for CSS
- Use hanging start curly for conditional blocks