Remove obsolete code.

The call to fetch blogs and primary blogs was part of the old reblogging logic.
Its unneeded now that we're relying on the list of blogs in the app.
Moves CommentViewController to correct location in project.
Removes unused / obsolete classes and assets.

Removes lingering quick photo classes and xib.
Removes autosaving indicator that is no longer used with the editor.
Removes some empty group items from the project navigator.
Moved cell classes to correct location in project.
Moves xibs under resources. Moves comment related header to comments.
Moves PostSettingsSelectionVC to the correct project location.
Progress on view refactor.

Views have been split up and organized into discrete classes.
First pass at autolayout.
Old views are preserved for now.
Merge branch 'develop' of github.com:wordpress-mobile/WordPress-iOS into issues/1729-layout-cleanup
Code style. Minor clean up.
Better constraint wrangling for action buttons.

Misc code style and tweaks.
Wire up action buttons in new views.
Code style cleanup. Removes obsolete class.
Let superviews decide whether to use autolayout
Use init instead of initWithFrame.
Use init instead of initWithFrame.
Delegate cleanup.

Also adds a pass-thru for `relayoutMedia`
Generalize attribution view some. Anticipate author or blog attribution
Implements and wires up the follow button in the new views.
Wire up action buttons in the post list.
Remove comments. Correct code style.