Merge pull request #449 from khawkins/unstable

Mobile SDK: Merging master into unstable
Do case insensitive comparison of callback URL, since it is returned in lowercase always
Merge pull request #450 from bhariharan/unstable

Do case insensitive comparison of callback URL, since it is returned is lowercase always
Auth manager delegate, custom delegate methods and actions
Merge remote-tracking branch 'upstream/unstable' into unstable