Add initial support for multiple companies

You can find screenshots and other files
related to the feature on Dropbox here:
https://www.dropbox.com/sh/wugnzqepwgzwlnh/AAAwNWA5hIKrP0y2VTu-LMHHa?dl=0

https://github.com/snipe/snipe-it/issues/23

app/controllers/AdminController.php

@@ -14,6 +14,8 @@ class AdminController extends AuthorizedController
         // Apply the admin auth filter
         //$this->beforeFilter('admin-auth', array('except' => $this->whitelist));
 
+        // CSRF Protection
+        $this->beforeFilter('csrf', array('on' => 'post'));
     }