Don't show comment form when tapping a comment and comments are closed.
Use convenience method when checking if comments are open.
Don't show the prompt label if the textview is the first responder.
Cleans up full screen mode a little bit.
Fixes an issue where a short post could loose its navbar/toolbar when commenting.
Fixes an issue where swiping a short post could loose its navbar/toolbar.
Fixes an issue where the toolbar would cover the comment/reblog forms while sending.