Merge pull request composer#322 from Nitaco/master

Update README because of new ShopwareInstaller types

Merge pull request composer#306 from micaherne/revert-201-patch-2

Revert "Support "atto" editor plugins introduced in Moodle 2.7+"

Fix comment

Merge pull request composer#298 from gulaandrij/patch-1

Update composer.json

Fix composer plugin api requirement

Fix php5.3 support