Improves plugin demo data
Improves coupon manager tests to get stable results

Conflicts:

	lib/mshoplib/tests/MShop/Coupon/Manager/Code/DefaultTest.php
Removes side effect due to catalog index cleanup
Adds increase() method in coupon code manager

Conflicts:

	lib/mshoplib/tests/MShop/Coupon/Manager/Code/DefaultTest.php
Fixes after merging from main repository

Conflicts:

	lib/mshoplib/src/MShop/Coupon/Provider/FixedRebate.php
Merge pull request #599 from nsendetzky/2014-04-30_stable-fixes2

Fixes coupon tests, removes index cleanup side effects and Improves plugin demo data