#21 add Product upload to a new brach for Peter
#000 Refactor the file
#23 Create model for the parameters
#23 Create and write the queries, but this not the final version
#23 Write the service method
#23 write the request method, but this not the final verson
#21 Added Category Dao and service
#20 Added product upload frontend modifies (design, validate, city and category dropdown list)
#21 Modified. Add city and category provider
#21 Merging ProductController and pull some changes
#23 Finish the queries
Merge branch 'Product' of https://github.com/szelli/Goods-Exchange into Product
#21 Added product update to product dao
#21 Added product update to product service
#21 Added product update to product controller
#20 Added product upload to frontend
#20 Added fake product to test the product upload
#24 add uploadTime to Product and Pictures entities and fixed Picture entity
#24 modify save product and add multipart properties
#24 merge picture upload backend