Merge branch 'release/1.7.2' into develop
add plugin for hitbox.tv
Merge pull request #248 from t0mm0/hitbox

Add plugin for hitbox.tv
plugins.twitch: Also support hours for VOD offset.
stream.hls: Lower connection timeout but allow retries.
stream.hls: Use first playlist for each quality in variant playlists.

Resolves #256.
It's now 2014.
stream.hls: Handle parser errors.
Update flashmedia.
stream.hds: Use global height as stream name if needed.
utils: Unify urlget and urlopen.
stream.http: Handle request sessions in __json__.
stream.hls: Remember cookies set by variant playlist response.

Resolves #258.
plugins.ustreamtv: Add __repr__ to UHSStream.

Resolves #251.
plugins.twitch: Also support the t parameter on VOD highlights.
cli: Don't pass our proxy settings to the player.

Resolves #260.
Implemented Cruchyroll plugin
Merge pull request #262 from asermax/crunchyroll

Crunchyroll plugin
plugins.twitch: Better subscription requirement detection.
tests: Add tests for Buffer.