Prepare for v0.5.5

Merge pull request gogs#483 from pkgr/dev

Add new distributions on https://packager.io/gh/pkgr/gogs

Fix UI issue

Merge pull request gogs#239 from baijum/docker_command

use 'docker.io' command instead of 'docker'

Update tag

Fix gogs#222

Prepare for v0.3.1 hotfix

Prepare for v0.3.0 release

Prepare for 0.2.0 release