Trebuchet : Empty view for live folders

Live folders are dynamically populated, hence allow the state of having
no items present in its folder. This commit adds a view to show when that happens,
rather than the current situation which looks broken.

Change-Id: I5777e208e5f0d5a3e42c1d65afdc2121d45d983a
Trebuchet : Live folder ids fix

Send the ids as a primitive long array rather than serializable

Change-Id: Ia2cc5d3df58cd8cbc695572c65cc03f61f1a6099
Merge "Trebuchet : Empty view for live folders" into cm-10.2
Merge remote-tracking branch 'cm-10.2' into jb3