Implements Redis cache
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
Fixes pre-dependencies for adding stock demo data
Fixes stock level check for selection product variants
Merge pull request #640 from nsendetzky/master

Fixes setup task dependencies and stock level check for selection product variants
Removes "edit" as default basket action to allow deleting coupon codes without error notification
Enforces coupon to be saved first before entering codes
Updates translations for coupon code message
Merge pull request #641 from nsendetzky/master

Bugfixes and improvements for coupon handling
Improves layout of coupon part in basket
Merge pull request #642 from nsendetzky/master

Improves layout of coupon part in basket
Set the size of the header and the height of the input field explicitely
Merge pull request #643 from nsendetzky/master

Set the size of the header and the height of the input field explicitely
Removes list bullets for coupon list in basket
Merge pull request #644 from nsendetzky/master

Removes list bullets for coupon list in basket