Adding documentation for the WILL_ADMINS variable
Adding myself (rbp) to AUTHORS
Using hipchat "@mention name" terminology
Using semicolon as separator for WILL_ADMIN, for consistency with  WILL_ROOMS (but allowing leading and spaces in admin names)
Merge branch 'admin_only'
WILL_ADMINS = "*" means everyone is an admin, and is the default when WILL_ADMINS is not set.
Merge branch 'admin_only'