[WIP] No Participation module

* Heavily encourage "don't vote or comment because you were linked in NP mode" via notifications. (**enabled** by default)
    * On loading a np.reddit.com url, show a  notification: Don't participate; brigading is bad mmkay?
    * On voting on an np.reddit.com url, show a notification: Don't vote; brigading is bad
    * On composing a comment on an np.reddit.com url, show a notification: Don't comment; brigading
    * On visiting any np.reddit.com which isn't a subreddit/multireddit post listing or comments page, show a notification: You can participate now, click here to return to regular reddit
* Add various options to block/undo voting/commenting (**disabled** by default)
    * hide vote buttons  (only if no vote already)
    * undo voting automatically  (same)
    * disable comment textarea
    * enable NP mode even subreddit swhere you're a subscriber

Concession for subscribers -- you're probably a community member already, so NP mode doesn't apply to you.


![screen shot 2014-06-09 at 12 34 26 am](https://cloud.githubusercontent.com/assets/455632/3213629/d41a455a-ef97-11e3-83a7-1b3562c35afe.png)

I strongly think this should go into RES v4.4 because RES now works on np.reddit.com.

Fixes #579