Prepare v2.2.0 release.

Signed-off-by: crynobone <crynobone@gmail.com>
Extract Publisher code to it's own repository.
Fixes indentation and update readme.
Merge branch '2.1' into 2.2

Signed-off-by: crynobone <crynobone@gmail.com>

Conflicts:
	README.md
	composer.json
	src/Extension/Publisher/AssetManager.php
	src/Extension/Publisher/MigrateManager.php
Merge branch '2.2'

Signed-off-by: crynobone <crynobone@gmail.com>

Conflicts:
	README.md
	composer.json