Finish webpage client for shop owner except order management
functionality;
Add shop review functionality;
Add order deletion functionality for app users;
Implement receiving images from Base64 encoded strings;
Corresponding modifications on ShopAction, ShopServer and its
implementation;
Improve existing html files;
Rename index.html as test.html;
Change home page to /Shop/login.html;
Change size of default logo for shop;
Add favicon.ico.