Merge pull request #636 from nsendetzky/master

Fixes indention of setup task
Merge pull request #637 from nsendetzky/master

Implements cleanup method in all managers to remove records of deleted sites
Merge pull request #638 from nsendetzky/master

Adds possibility to wrap decorators around admin managers
Adds downloads and license badges
Merge pull request #639 from nsendetzky/master

Adds documentation for manager/sub-manager class configuration
Improves basket coupon layout
Merge pull request #640 from nsendetzky/master

Fixes setup task dependencies and stock level check for selection product variants
Merge pull request #641 from nsendetzky/master

Bugfixes and improvements for coupon handling
Improves layout of coupon part in basket