Preliminary GM support in CVS

[why the lucky stiff]

Hi, I've started merging the GM support from Hoodlum (pre-MouseHole) 
into MouseHole.

Basically, if you hit a user.js file, you'll get the same options you 
get with user.rb files.  When a page qualifies for script inject, I'm 
just injecting into a <script> element at the bottom of the page.

None of the GM_API is supported yet.  We shouldn't have any trouble 
supporting all of it.

It's biggest weakness is that it leverages the window.onload handler.  
I'm not sure if leeching the onload off another element or something is 
the way to go yet.  Whatever the case, I want to work on making it 
browser agnostic.

_why