Add hitbox.tv integration

[Andygmb]

Not sure how it would work with an existing subreddit - perhaps a new setup.py should be run to make all the existing streams marked as twitch then any future ones will be marked as hitbox? So changing /streams/ from

name1,
name2,
name3,

to

http://twitch.tv/name1
http://twitch.tv/name2
http://twitch.tv/name3

then any future streams will be added with the link included.

Or, maybe make /streams/ into json like /twitchbot_config/ is.

[Andygmb]

Actually I think changing /streams/ to be json like:

{"hitbox":[stream1, stream2, stream3],"twitch":[stream1, stream2, stream3], etc...}

would be the best way to go about it.