workaround to the annoying node/add access bug introduced by og_field_pe...

Ok gang! This node/add issue is really getting to me and as a TEAM we have wasted enough f*** time on this. This PR has a working *workaround* to the issue which will prevent any users without the 'administer nodes' permissions from accessing node/add.

Somebody merge this damn pr or I will lulz. kthx

Oh and please don't forget to remove node/add path alias at `admin/config/search/path/delete/2956?destination=admin/config/search/path/list/node/add` and of course enable the module `drush -y en nyccamp_hacks @pantheon.nyccamp2014.live && drush cc all @pantheon.nyccamp2014.live`.

Enjoy the rest of your weekend. See you during the week, I should be resting but you keep pulling me in. 
Credits go to @jonpugh for the drupal centric code.