[FIXED] Set lastUsed when creating a new site since elements can't
be saved without that value set.
[UPDATED] Configuration for tinting of status bar.
Doesn't work yet with the custom navbar container image:
Should check if last row of that image's pixels isn't too
dark. iOS 6 apparently averages it for the tint color.
[IMPROVED] Make persistence more lazy to avoid UI blocks.
[IMPROVED] Use "Master Password" as CFBundleDisplayName at runtime. No
home-screen length restrictions there.
[FIXED] Inform Apptentive of significant events.
