Merge pull request #173 from AzureAD/master

master to dev
Revert 2d0123f..56307ca

This rolls back to commit 2d0123f325abe2dcf92a898547ff73bb28998b11.
fixed view controller issue
Fixed issue #175

fixed
https://github.com/AzureAD/azure-activedirectory-library-for-objc/issues
/175
Fixed issue #170

Fixed
https://github.com/AzureAD/azure-activedirectory-library-for-objc/issues
/170
fixed keychain issue

fixed keychain issue
fixed podspec
Merge pull request #176 from AzureAD/dev

Dev