Port tests for CDTIndexManager to new CRUD API
Fix bug where new create CRUD API didn't fire change notifications
correctly

The notifications from TouchDB happened within a transaction for
the -createDocumentFromRevision:error: method, which probably meant
that any database calls happening in the notification callback didn't
see the changes the notification was in response to.

I therefore added a call to the notification handlers when we've
closed the transaction if it was successful.

I think there's still an issue with deleteDocumentById:error: right now,
but it needs further investigation.

RTC 52139
Add notifcation tests for new CRUD API
Set OBJC_DISABLE_GC to allow running tests in Xcode 6

We still allow tests to run on both Xcode 5 and 6.

This means we have to have com.apple.product-type.bundle (which Xcode 5
understands but Xcode 6 likes to change) and the OBJC_DISABLE_GC that
Xcode 6 needs to run the tests.
Fire summary notification when calling -deleteDocumentWithID:error:
Merge pull request #61 from cloudant/34357_index_manager_not_updating

34357 index manager not updating