Merge pull request #32 from broggi/master

ExpandableListViewAdapter & Design Changes
corrected getCount
Merge pull request #33 from marcSchneiter/master

corrected getCount for ShoppingLists and Items
Updated the ShoppyApp Documentation to the current developement state
Merge pull request #34 from LukasGalliker/master

Updated the ShoppyApp Documentation to the current developement state
do jo sowieso ke code gänderet worde esch merge ech etz eifach :D