* File local.properties added to git ignore list
* Some refactoring (renames and structure changes)
* Main menu items extracted into enum. Each menu item stores display name and link to activity class
* Added stub for working with camera
* Fixed bug: "Activity has leaked IntentReceiver"
* Simple implementation of system app Camera. Can take thumbnails and save full-sized photos to storage
* 'gen' folder added to .gitignore