Startup UI improvements.

[IMPROVED]  Fade-in effect when opening Master Password.
[IMPROVED]  Shade of circular shadow fixed between launch image and
            background image.
Icon update.

[UPDATED]   Icon graphics updated.
Listing all sites now with bookmark button and modal VC.

[ADDED]     Modal VC to show all sites.
[UPDATED]   All sites button on search bar now uses bookmark button.
[REMOVED]   Query string hack for search results button.