Updated Sublime Plugin to support version 3

Sublime Version 3 drops the version number from the application path,
so if you enable this, and use 3 - the existing plugin would
silently fail.
Merge pull request #102 from talios/patch-1

Updated Sublime Plugin to support version 3
Closes #81:  default to python2 and fallback to python
Detect / Launch both Sublime Text 2 and 3
Implement subl for Linux (assuming a standard .deb install of v3)