* Use lang/ruby/gem.mk instead of misc/rubygems/rubygem.mk.
* Add LICENSE.
* Update dependency according to gemspec.
* Add CONFLICTS since it will install the same name commands both
ruby18 and ruby19 based packages.
merb-core is the heart of the merb MVC framwork. It has the rack
abstraction along with the dispatcher, router, controller and view
layers. You can make very fast, small footprint services and apps with
just merb-core.