Removes extended format bar. Removes list, code and toggle buttons.

Stubs an underline button.
Removes obsolete code.
Refs: #591
Deletes WPKeyboardToolbar as its no longer being used by anything.
Consolidate and remove WPKeyboardToolBarWithoutGradient.

Let's just have one keyboard toolbar class for now since only one is being used.
We'll rename WPKeyboardToolbarBase in subsquent commit.
Corrects format button heights when rotating from landscape to portrait.

Refs #591
Anticipates image for underline button.

Refs #591
Removes old references to removed formatting options.

Removes old stats keys.
Removes references in the post editor.
Refs #591.
Icons for formatting toolbar

Ref #591
Updates format bar with new icons.

Removes obsolete code related to sizing the buttons.
Cleans up some other code.
Refs #591
Merge branch 'develop' of github.com:wordpress-mobile/WordPress-iOS into issues/591-formatbar-refresh
Tinted images for highlighted states.

Refs #591
Merge branch 'develop' of github.com:wordpress-mobile/WordPress-iOS into issues/591-formatbar-refresh
Merge branch 'develop' of github.com:wordpress-mobile/WordPress-iOS into issues/591-formatbar-refresh

Conflicts:
	WordPress/Classes/EditPostViewController.m
Merge pull request #771 from wordpress-mobile/issues/591-formatbar-refresh

Issues/591 formatbar refresh
I double checked with Tom if this was a go other than the icons and got his thumbs up.  I'll open a new issue for an icon iteration. 
Merging this.