Add missing [super viewDidDisappear:animated]
Merge pull request #47 from aburgel/master

Add missing [super viewDidDisappear:animated]
Assigning a "nil" property to tintColor discards any UIAppearance, so checking before assigning.
Ability to specify position (left or right) of the barButtonItem + exposing it.
Ability to hide the toolbar (also with expanded constructors) while staying compatible with the current code base (default is showing the toolbar).