minor fixes.

add .github folder.

extended hls proxy manifest replacement logic.

Merge pull request #17 from m1k1o/hls-vod

(WIP) Hls vod

Merge pull request #15 from m1k1o/hls-exit-on-error

HLS: add error to OnStop.

Merge pull request #3 from klahaha/tests

Some refactoring

use process group.

fix typo.

upgrade dependencies.

add license.