Custom access callback for node/%/likes

## Ready State: Yes

Initial implementation of custom access callback for disabling / denying access to the node/%/likes page when user does not have access or no likes on the content.

## Deployment

* Merge code.
* Enable `views_access_callback` with `drush en views_access_callback -y`
* Revert this feature `drush fr imagex_content_likes -y`
* Clear cache `drush cache-clear all`