Merge pull request #219 from mman/master

copy UINavigationBar titleTextAttributes from presenting view controller to MFMailComposeViewController
Add removeObjectForKey method to IASKSettingsStore protocol.
Also implement this method in File and UserDefaults Settings store.
Updated README: IASK is now ARC-enabled
Improved subclassing of IASKAppSettingsViewController

by not removing all notification observers but just the ones we added
Merge pull request #225 from olicarbo/upstream

Add removeObjectForKey method to IASKSettingsStore protocol.
merges