webkitbot should recognize its own nickname in greetings.
https://bugs.webkit.org/show_bug.cgi?id=115196

Reviewed by Andreas Kling.

Make webkitbot recognize other forms of its nick. Also be tolerant of spaces between the nick and !.

* Scripts/webkitpy/tool/bot/irc_command.py:
(Hi.execute):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@149132 268f45cc-cd09-0410-ab3c-d52691b4dbfc