Disable animations

fixes #1058.  Despite being a little heavy-handed, it's only an 80% solution.  Also, it's for all of reddit -- no subreddit-specific option at this time.


However, the cure can be worse than the disease:
![screen shot 2014-05-13 at 9 58 23 pm](https://cloud.githubusercontent.com/assets/455632/2966515/ad74f244-db13-11e3-9ca3-b3263cc51604.png)