fix incompatibilities with command-line debug

Author: denofevil

lib/ruby-debug/interface.rb

@@ -12,8 +12,10 @@ def non_blocking_gets
 end
 
 module Debugger  
+  class Interface
+  end
 
-  class RemoteInterface # :nodoc:
+  class RemoteInterface < Interface # :nodoc:
     attr_accessor :command_queue
 
     def initialize(socket)

lib/ruby-debug/processor.rb

@@ -7,10 +7,8 @@
 end
 
 module Debugger
-  # this class is added to resolve problems, with ruby-debug gem incompatibility see
-  # http://rubyforge.org/tracker/index.php?func=detail&aid=27055&group_id=3085&atid=11903
   class CommandProcessor
-    def initialize(interface)
+    def initialize(interface = nil)
       @interface = interface
       @printer = XmlPrinter.new(@interface)
     end