Add CodeMirror lib
Add initial files for CodeEditor
Prevent scaling in SageActivity
Add fontawesome for icons
Add new libs
Add icons
Remove unused icons
Add bracket highlighting, modify function names
Update resources

- Remove some entries from menu xml
Add events for otto
Fragment and Otto migration

- Use otto (nearly) everywhere
- Code Editor and Output now in seperate fragments
- Run moved to action bar
- Add a seperator line between the views
-Additional misc. fixes
Swap icons for expand/collapse
Add functionality to toggle buttons