Merge branch 'hotfix/1.5.2'
Merge pull request #184 from kasper93/develop

Add plugin for Hashd.tv
Update AUTHORS.
Update CHANGELOG.
Update docs.
Release version 1.6.0.
Merge branch 'release/1.6.0'
Merge branch 'release/1.6.0' into develop
Update README

Include link to mailing list.
stream.hls: Encryption key URLs can be relative.

Fixes #186.
cli: Add --player-no-close option.

Resolves #189.
cli: Fix bad shlex behaviour.

This fixes un-quoted player paths containing backslashes.
cli: Fix weird socket behaviour on Windows.
Update CHANGELOG.
Release version 1.6.1.
Merge branch 'hotfix/1.6.1'
Merge branch 'hotfix/1.6.1' into develop
Convert README.md to rst and add CONTRIBUTING.rst.
plugins.twitch: Only authenticate once.
plugins.twitch: Use the new HLS API.