remove opal stuff

lib/opal/rails/haml_filter.rb

@@ -1,19 +0,0 @@
-require "haml"
-require "haml/filters"
-require "haml/filters/base"
-
-module Haml
-  class Filters
-    class Opal < Base
-      def compile(node)
-        temple = [:multi]
-        temple << [:static, "<script type='text/javascript'>\n"]
-        temple << [:static, ::Opal.compile(node.value[:text]) ]
-        temple << [:static, "\n</script>"]
-        temple
-      end
-    end
-  end
-end
-
-Haml::Filters.registered[:opal] ||= Haml::Filters::Opal