Log Message:
Update ruby-debug to 0.10.4.

0.10.4
10/27/10

 - Various bug fixes:
   * reload command.
   * plain 'info' command
   * improve list and list - (backwards) handling when hitting end of file
 - Add ability to specify port to debug on
 - Allow breakpoints at class methods
 - "quit!" is same as "quit unconditionally"
 - irb improvements: Access to non-executing rdebug commands inside irb via
   "dbgr" method
 - Go over documentation including that created by rdoc.
 - For emacs package: add README, INSTALL, AUTHORS.