Added token test
Added shopping item model and its tests
Added shopping list model and its tests
Removed unnecessary whitespace in user model
Fixed wrong shop key in ShoppingList.to_hash method
Removed whitespaces from user test
Added circle model and tests
Added Circles api test
Fixed error when saving/updating circle without shopping lists
Rack support for tests
Added api methods to circle
Resolved conflicts between circles and origin/circle
Fixed wrong class name for circles api
Fixed access to members in circle model
Added GET circle by id into circles api
Added tests for GET circles method
Bunch of frontend improvements
Fixed some bugs in circles api
Added user api
Added loading of circles and users api