Merge pull request #38 from broggi/master

Continued work on ExpandableListView
fixed tests and added some new ones
Merge pull request #39 from marcSchneiter/master

fixed tests and added some new ones
Upadet so that the number of unbought items is displayed at the right border and you can input 0 in the quantity
Merge pull request #40 from cryptedp/master

Upadet so that the number of unbought items is displayed at the right bo...