Custom NSURLProtocol to auth fetching private site content.
Only process requests to wpcom sites
Better check for wpcom site
Adds convenience methods to reg/unreg the protocol.
Replace dup call to saved topic & fetch default topic.
Merge pull request #2830 from wordpress-mobile/issues/fix-call-for-default-topic

Replace dup call to saved topic & fetch default topic.
Require https and just check wpcom domain.
Make updating regcount thread safe.
Merge pull request #2823 from wordpress-mobile/issues/load-private-images

Custom NSURLProtocol to auth fetching private site content.
Merge branch 'develop' into feature/ProgressOnMedia

Conflicts:
	WordPress/Classes/ViewRelated/Post/WPPostViewController.m
	WordPress/WordPress.xcodeproj/project.pbxproj