Cleanup view controllers

Cleanup view controllers and remove some outdated code.
Add parser class

Move the parsing out of comments and entries model and into another
class.
Add libextobjc and cleanup models

Remove old KVO logic and continue to cleanup models. Add libextobjc and
use weakify/strongify macro within RACObserve code.

Start using new class for paring HTML.
Reorganize folder structure

Filesystem move.
Replace plist with database

Begin removing plsit storage. Add YapDatase. Add cache manager for
handling entires and comments.