Fixed x-y coordinates of raster image, fixed a bug where multipe objects in a single layer were not being exported

Added scaling support - so you can resize the image in inkscape and have it raster at the right size

Rastering for images embedded in inkscape layers - does not handle resizing of image yet, will export at original resolution for raster independant of inkscape resizing of the image. Also need to put in the M positioning codes before the raster

Updated my cutting surface to have guides for the little metal engraving area. Updated cutting settings for materials

Fixed division cutting off floating points for smoothie. Fixed error messages to correctly print in Inkscape dialog box

07-March-2015 - 10 hours : Cleaned up the exporters code a lot. Added ppm and feedrate detection from
the layer name. Updated the gcode that is exported to be neater and work better with
pulsed mode using G01, G02 and G03 commands.

07-March-2015 - Fixed the G28 command at the end of the job. Added defaults for laser power,
feedrates and ppm if defined. If ppm isn't defined in the layer options it will operate as
continuous wave mode. See the help in the extension dialog for how to use.

07-March-2015 - Marlin codebase mod : You need to patch the Marlin codebase to turn on the
laser before moving for G02 and G03 commands. This plugin assumes this has been done. More
details to come in the future. Copy the code from the G01 above in marlin_main.cpp

Added misc changes

This reverts commit 2e58807e.

A few changes to gcode generation:
+ M3 commands include laser intensity (S[0-100])
+ G00 (move w/laser off) get feedrate independent of cut moves
+ G01-03 (cut moves) get feedrate independent of G00 rate
+ Option to insert home all (G28) before starting
+ All above get fields/toggle in dialog
- Removed header and footer in out put (was causing me issues)
+/- more appropriate comments