Prevent the navigation bar and toolbar from blinking when the crop view is displayed
Only set the toolbar items if they haven't been specified
Merge pull request #28 from brockboland/toolbar_buttons

Only set the toolbar items if they haven't been specified
Merge pull request #27 from brockboland/toolbar_blink

Crop view: prevent the navigation bar and toolbar from blinking
Merge commit '839620740e027e92f71b3b869845227c7ec789e0'

* commit '839620740e027e92f71b3b869845227c7ec789e0':
  Only set the toolbar items if they haven't been specified
  Prevent the navigation bar and toolbar from blinking when the crop view is displayed