Reformatted code
Add invites feature
Update libraries version

Underscore, lodash and Backbone updated. Lib folder was cleaned up a little bit also.
Fix typo on attribute
Refactor datastore module and usage

Datastore use localstorage now.
Add game board feature

Adds the game board to view started matches. Using chess.js and chessboardjs for
this purpose, take a look to projects dependencies on readme file. Adds also a
game hitory and board module.