Add new REST API for manipulating wishlist

 * These APIs are used to test CRUD operation simply
 * The followings are description per http method

     /api/wish
      - GET: getting full list of requsting user
      - POST: creating new wish of requesting user

     /api/wish/:id
      * ':id' means existing wish's identifier created by server
      - GET: getting only one of ':id' among wishlist of requsting user
      - PUT: updating ':id' wish of requesting user
      - DELETE: removing ':id' wish of requesting user

 (TODO) 1st party client samples should be modified these APIs to be used!