Added a simple wrapping of the debugger JSON responses.

Added a 'dir' command to the command line debugger to display the details of an object including the handle number for the object and the objects that it references.

Added the ability to use #XXX# to a 'print' or 'dir' request. XXX is the handle number for the object.
Review URL: http://codereview.chromium.org/18589

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@1154 ce2b1a6d-e550-0410-aec6-3dcde31c8c00