customize html5 game

I need some changes to an existing website. I need someone who can make small modifications to the open source HTML5 Game "Browser Quest" Source: [login to view URL] Online demo: [login to view URL] The idea is to add a few social functions to the game and to integrate them with our social network (Joomla + Easysocial). My website: [login to view URL] (protected URL) Modifications: ################## - Game must save state on server for each user. When a user closes the game and starts playing on a different device then game will resume where the player stopped. the game should create 1 character with joomla username for every player. -players must be able to invite social friends to the game -Add option to share in game level achievement on my websites activity stream. Documentation: [login to view URL] - Enable PvP arena option. This feature is available for the windows version, but the html5 source does not have this option - Add options so that players can collect items in game and trade in the same game with "user friends" from our website / social network (collect: potions, weapons and armor) - Integrate simple Farming option with browserquest. (users will need to be able to buy potions, weapons and armor with in the "farm store" with the money earned from harvesting crops) HTML5 Farm Game Source: [login to view URL] HTML5 Farm Game Documentation: [login to view URL] - Weapons & Armor will last infinitely by default. You will need to make changes so that weapons and armor will only last 20 strikes before broken. ################################## please write detailed documentation about all of your steps with comments & code.