Add cmb to user-new.php

Cmb was not showing up when creating a new user, but only when editing an existing one. This is no longer the case. Now when creating new users you have the chance to add all the info right on the new-user.php page.

Signed-off-by: Emanuele <feliziani.emanuele@gmail.com>
Merge pull request #645 from GioSensation/trunk

Add cmb to user-new.php. props @GioSensation
Update image paths. Addresses of the issues in #652
Fix oembed caching for options pages
Switch to $post_type variable already created. Closes #661
Merge remote-tracking branch 'upstream/trunk' into trunk
Updated the meta-diff functionality according to feedback from @jtsternberg