Working Dropbox OAuth
OAuth request moved to NoteListActivity
Dropbox Oauth moved to DropboxHelper class
Listing of notes added
Store files on Dropbox added
added load note from Dropbox
Viewing notes added.
ActionBar title changes into note title
Delete notes added
Delete note confirmation dialog added
Merge remote-tracking branch 'origin/Dropbox' into development
Merge remote-tracking branch 'origin/ViewNoteActivity' into development
Merge remote-tracking branch 'origin/DeleteNote' into development