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.

and, of course, the option is disabled by default. (i.e. leave alone animations unless user specifically sets it.)


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)