Update app/assets/js/controllers/editor_controller.coffee
Update app/assets/js/controllers/editor_controller.coffee

Downloaded themes had a ".tmtheme" file extension. It should be ".tmTheme".

Fixes this issue https://github.com/aziz/tmTheme-Editor/issues/11
thiagolucio/tmTheme-Editor,runxel/tmTheme-Editor,aziz/tmTheme-Editor,mcanthony/tmTheme-Editor,esironal/tmTheme-Editor,aziz/tmTheme-Editor,snehesht/tmTheme-Editor,snehesht/tmTheme-Editor,tushortz/tmTheme-Editor,runxel/tmTheme-Editor,thiagolucio/tmTheme-Editor,thiagolucio/tmTheme-Editor,mcanthony/tmTheme-Editor,hackwaly/tmTheme-Editor,tushortz/tmTheme-Editor,hackwaly/tmTheme-Editor,runxel/tmTheme-Editor,hackwaly/tmTheme-Editor,mcanthony/tmTheme-Editor,aziz/tmTheme-Editor,snehesht/tmTheme-Editor,esironal/tmTheme-Editor,esironal/tmTheme-Editor,tushortz/tmTheme-Editor