Add tags to show content for admin only

[mcroteau]

[[HAS_ADMIN_ROLE]]
Administrator content
[[/HAS_ADMIN_ROLE].

Might be only good for layout, will need to revisit for page content and product content as well. Might also want to consider Role maintenance and having the tags check for any role.

Example:

[[HAS_ROLE::ROLE_CUSTOMER_SERVICE]]
Customer service content
[[//HAS_ROLE::ROLE_CUSTOMER_SERVICE]]