[SVN] Web Preview Environment

[Thomas Aylott - subtleGradient]

When in the processing of the Web Preview Window refresh does it parse  
the filename of the pass through script?

I've already figured out that it handles shell variables in the path  
name.
EG: set the pass through command to "$TM_WEB_PREVIEW_SCRIPT" and then  
set that variable in the preferences window and it works.

What I want to come up with is a way to set the pass through command  
depending on the scope.

I guess it might be possible to use a Preference bundle item to set  
the $TM_WEB_PREVIEW_SCRIPT environment variable.

Any thoughts?