Check for RubyMotion 2.0 compatibility.

[mattsgarrison]

No reason this should be limited to just iOS, the same principles apply to OSX app development and icons as well.

Need to investigate the OSX build process and icon resource locations.

[mattsgarrison]

Some discussion on RM2.0 and OSX icons and packaging: https://groups.google.com/forum/?hl=en#!topic/rubymotion/TxkA9IjRRM4