Save AccountForm.xib with Xcode 4.6.2
Add accessibility labels to account type buttons

Before this change the buttons were spoken right, but it was probably because
IBUINormalTitle is set in the XIB which seems to have no place in IB to be set.
So to be explicit and on the safe side, add explicit accessibility labels
to the buttons.
Disable accessibility for account type labels

The account type labels duplicate the information contained in the account type
buttons, so to streamline the VoiceOver UI, disable them for accessibility.
Save EventCell.xib with Xcode 4.6.2
Disable accessibility for gravatar event button

The user is already available in the event text. This makes navigating events
table view more streamlined (only 1 item per event).
Accessibility labels for toolbar buttons in code/blob viewer
Add accessibility to the menu reveal button

Hint is needed since moving to the menu and dismissing of the menu is
non-intuitive and unusual for VoiceOver users.
Improved accessibility for ECSlidingViewController

See #392
Merge branch 'accessibility' of dusek/ioctocat