added method "for_roles" which accepts one or more roles and a block to be run for those roles.
added method "for_roles" which accepts one or more roles
and a block to be run for those roles.

zippy/deprec,zippy/deprec,zippy/deprec,saimonmoore/deprec,saimonmoore/deprec,zippy/deprec,bschwartz/deprec,zippy/deprec,saimonmoore/deprec,bschwartz/deprec,saimonmoore/deprec