Created nav partials

* Created nav directory in views
* Created partials login and primary
* Changed application template to render partials
Created admin scaffold for Player
Added validation to Player

* Added validation to player model
* Whitelisted appropriate fields in players_controller
* Added fields to show view
Fixing json responses for Players admin controller

* Added name, goals and assists to players index and show views
* Changed urls from regular urls to admin urls in players and teams index views
	(ie. players_url to admin_players_url)