Support flagging content

Also add delete action to detail view (in addition to delete being supported through master comments view)
Unwrap HTTP errors from livefyre.com
SDK: rewrite method for collection creation

Comments app: only show delete icon (with no text) for those comments
that are pending for deletion.
Support LiveReviews

Also add more enums for API entities and fix a potential issue with error unwrapping.
Improve documentation
update podspec
Merge branch 'master' of github.com:Livefyre/StreamHub-iOS-SDK