[UPDATED] Guide updated with UI changes.
[FIXED] Don't animate pushing the unlock VC when appearance of main
VC is not animated (eg. application startup).
[FIXED] rememberKey -> rememberLogin in settings bundle.
[REMOVED] saveKey from settings bundle.
[UPDATED] Removed lock from the Default image; show a dummy avatar
instead.
[FIXED] Don't forget key when signing out.
[UPDATED] Crashlytics.
[IMPROVED] Sending logs and configuration to crashlytics, added
sendDebugInfo option that allows the user to choose to send
more info. Now also sending a device identifier.
[ADDED] Avatar selection dialog when a new user is created.
[FIXED] Unlock screen.
[FIXED] Internal fixes.
[ADDED] Avatar selection in preferences.
[ADDED] Implementation of the other preferences.
[IMPROVED] UI of unlock and preferences screens.
