Securely close SSL connection by standard SSL_shutdown

For SSL in close_connection, current implementation use close_socket_gracefully to close socket firstly, then SSL_free. In my
testing, this approach may cause some pending write data missing. I'd suggest use standard SSL_shutdown in SSL conection. It
need call twice according to openSSL manual - one call sends the close_notify alert and one call receives the response from
the peer

Added .mov (quicktime) to builtin_mimes_types

Lua functionality change: print renamed to mg.write, read renamed to mg.read. Expanded user manual, fixed example pages.

lsp_mg_read: remove dead code, return nil on empty read

Fix parameter 1 for select in poll()

_CRT_SECURE_NO_WARNINGS should not generate a warning if already defined

	modified:   mongoose.c

Environment variable required for PHP cgi

In few windows machines, the environment variables "ProgramFiles" is required to successfully execute PHP code especially socket functions.