issue/1600-comment-likes-modularization

Fix #1600 - comment likes are now enabled in the Reader.
This icon still looks upside down to me ;) Don't reply arrows usually point to the left? cc @drw158 
![note_icon_reply](https://cloud.githubusercontent.com/assets/789137/3631702/e97720e4-0eb9-11e4-9a53-aa584ddce3e0.png)