Add license info for m3u8

For future reference, upstream is https://github.com/globocom/m3u8
Cleanup game_versions_ids post publish_point rework

This also drops the isLive property.
Rename get_publishpoint_url to get_publishpoint_streams

Make game_type parameter optional
Simplify user-agent to only iPad

It's the only part of the string they seem to be sniffing for, so let's only send
that.

I noticed no decrease in bitrate streams with this. 2013 RedZone
archives were 4500. Latest game streams were 3000.
Small cleanup
Update readme

BaumSchorle's made a bunch of improvements. We should brag about them.
;-)