Post detail changes:

* Fixed #258
* Removed webView code that doesn’t work on KitKat
* Decreased margin between title & content
Post detail now prefixes video embeds with http: if they start with //
code cleanup
First pass at immersive post detail on KitKat
Removed post list row animation, except when changing tags or loading new posts - #268
Fixed #274 by removing script blocks in comments
Comment box on post detail is now one line tall, auto-expands to four lines while user types
Merge branch 'develop' into feature/native-reader
Merge branch 'feature/native-reader' into feature/comment-unification