Cleans up obsolete code realted to posting.

Removes orphaned / dead code.
Removes iOS6 / iOS7 branching. Favors iOS7 only.
Removes unused IBOutlet and IBAction declarations.
PostMediaViewController now inherits from UITableViewController.
Deleted obsolete xibs for PostMediaViewController
Removes references to EditPostViewController in PostMediaViewController and PostSettingsViewController.
Misc. other clean up.
Deletes CTidy pod that kept creeping into my commits :p
Merge branch 'develop' of github.com:wordpress-mobile/WordPress-iOS into issues/686-editor-cleanup

Conflicts:
	WordPress/Classes/EditPostViewController.m
Additional cleanup.

Removes commented includes
Removes synthesise directives and redundant ivars.
Removes merge markers.
Merge branch 'develop' of github.com:wordpress-mobile/WordPress-iOS into issues/686-editor-cleanup

Conflicts:
	WordPress/Classes/PostSettingsViewController.m
Merge pull request #696 from wordpress-mobile/issues/686-editor-cleanup

Cleans up some obsolete code related to posting.