add parfait block

lib/parfait/block.rb

@@ -0,0 +1,23 @@
+module Parfait
+
+  # A Block is a callable object, much like a CallableMethod.
+  # Surprisingly similar in fact, as the block is really only missing the name.
+  #
+  # The difference lies mostly in the way they are compiled
+  #
+  # Also both have a list of blocks defined in their scope. But this is
+  # notimplemented for blocks yet
+  #
+  class Block < Callable
+
+    def ==(other)
+      return false unless other.is_a?(Block)
+      super
+    end
+
+    def inspect
+      "#{@self_type.object_class.name}(#{arguments_type.inspect})"
+    end
+
+  end
+end