Initial setup of tabs
Refactored code slightly - moved the commencement of Photo observing out into its own method.
Minor file cleanup
Setup three different tabs using fragments & a Grid View

I'll work further on the UI tomorrow to try and get different icons displaying in place of the filenames & subclass to better display the file content.
Merge remote-tracking branch 'origin/master' into gb-setup-tabs

Conflicts:
	Bag/src/com/codepath/android/bag/RecentFilesActivity.java
Merge pull request #8 from gemmakbarlow/gb-setup-tabs

Gb setup tabs
Added method to try and create thumbnails, given a file URL (not yet used).
Merge remote-tracking branch 'origin/master' into gb-thumbnails