Remove demo warnings

This pull request has two commits that remove all warnings from the Demo.

One commit switches the CoreParse pod to @siuying's fork. This fork has some essential changes that avoid compilation warnings. These changes are also in the main CoreParse repo, but the maintainer has not yet made a new tag to allow us to use them. If you accept this pull request, *please update the podspec in the CocoaSpecs repo to use* `CoreParse@siuying`. 

The other commit updates the Xcode project using the "Validate Settings" command.