highlight list background when pressed
changed background color of sheetView
composer image size changes from 100dp -> 80 dp per row
updated download icon asset and updated sheetListView to include download icon
Merge branch 'sheetListView'
login and logout are feature complete at the login level.
UI changes are planned for the next commit.
implement search via a default android search widget. This widget broadcasts
an intent, recieved by sheetListView. Then processed as a query to the server.
The end goal is to have sheetListView display the results returned by the
server query in a similiar fasion as /api/?order_by=popular.