[iOS] Allow NSURLconnection to use delegate queue

Client now has a public property to let the connections use a delegate
queue instead of the calling thread
[iOS] Code review updates and minor cleanup

Update test case test
Update how push.h is included
Add newline to MSLoginController due to issue with Doxygen
Merge pull request #313 from phvannor/login-main-thread

[iOS] Allow NSURLconnection to use delegate queue
Correct visibility of Push on Xamarin iOS
Merge pull request #316 from toddreifsteck/master

Correct visibility of Push on Xamarin iOS
Update CHANGELOG.md
Merge remote-tracking branch 'origin/master' into dev
[offline][managed][client] 1.3 alpha4 release notes
Merge branch 'dev' into offline

Conflicts:
	sdk/iOS/src/MSClient.m
	sdk/iOS/src/MSClientConnection.m