Fix handling of twitch.tv URLs
changed back to redirect and adjusted rtmp split
Merge pull request #663 from pencil/twitchtv

Fix handling of twitch.tv URLs
Twitch - Use framework function for url encoding.
Merge pull request #665 from shopgirl284/mtvfix

changed back to redirect and adjusted rtmp split
Vimeo - Skip over None values for bitrates.
xHamster - Find mp4s, redone http://git.io/5E9mUw
Lifetime - Create valid json