fixHideLink works on multi-subreddits now
http://www.reddit.com/dev/api#POST_api_hide currently only requires post ID and modhash.  it appeared to be breaking on feeding a multi-sub into the (obsolete) subreddit parameter, which isn't surprising.  I really should've fixed this six months ago when I noticed the error happening but didn't notice it was only on multi-subreddits.

i don't understand what the executed and renderstyle params are for, there's probably a more efficient renderstyle but whatever.
Merge pull request #378 from andytuba/fixHideLink-multireddits-fix

fixHideLink works on multi-subreddits now