Cell looks: Move SET_LOOKS_TABLE_CELL call to willDisplayCell method

According to apple docs, cell looks should be configured in willDisplayCell
instead of cellForRowAtIndexPath
Table background: Fix bug with image view

Image view was not rendering for iOS 5. This path fixes image view
for iOS 5 but is still compatible with iOS 6.
Navigation bar appearance: Change color

Previously a max gradient value was used. Since iOS does gradient
automatically, we use a middle-valued color.
App icons: Change app icons to cartoon finger

Use new icons from Richard