Capturing traces guide

[David Kennedy <dkennedy tinytoad com>]

I've included a new page on b.g.o which explains how to capture stack
traces. I've wished many times for such a page when I was needinfoing a
bug with "Please capture a stack trace", so I'm sure other people will
find it useful as well.

http://bugzilla.gnome.org/getting-traces.cgi

Let me know if you have any suggestions,

David