Quick Blocker Improvements

Improved buttons, matching the 4chanX filter button styles

Universal script support, removing the dependency on 4chanX, and supporting 4chan semantic URL slugs.

![4chanX](https://cloud.githubusercontent.com/assets/6633539/4782134/db14ee6e-5cde-11e4-8010-01068de5a3c9.png)
![AppchanX](https://cloud.githubusercontent.com/assets/6633539/4782133/db14d8fc-5cde-11e4-960a-5996794683ca.png)
![Vanilla](https://cloud.githubusercontent.com/assets/6633539/4782132/db149acc-5cde-11e4-994d-22ec41e36c32.png)