Add #tell method to Context for convenience

allows to tell messages to self

Author: pitr-ch

lib/concurrent/actor/context.rb

@@ -71,6 +71,17 @@ def default_reference_class
         Reference
       end
 
+      def tell(message)
+        reference.tell message
+      end
+
+      def ask(message)
+        raise 'actor cannot ask itself'
+      end
+
+      alias_method :<<, :tell
+      alias_method :ask!, :ask
+
       private
 
       def initialize_core(core)