feature: a simple function to copy the uri at point to the kill-ring

[faried]

code: http://paste.lisp.org/display/113443

If I see a tweet that I want to share (in email, on irc, or even on twitter to one person instead of retweeting to all my followers), I need to grab its link.

[cvmat]

Thank you for contribution. I have imported your patch with some modifications. Please check it.

[faried]

It works great. Thank you for checking it in!