made test case import Foundation instead of UIKit
working on Store class
removed semicolon
finished Store's initializer
made skeleton for Store class

and added jsonWritingOption
working on Store search request
working on status errors in Store
working on error conversion for ErrorCode
reduced NSError generation code
working on search request

implemented custom error
finished func performSearch
implemented findOrCreateEntity in Store
implemented findEntity
implemented JSONObjectFromCoreDataValues in Store
implemented setJSONObject in Store
working on getResource
implemented getResource
implemented fetchEntity in Store
fixed performSearch error bug
finished func createResource in  Store