[Radiant] how to install an extension?

[Sean Cribbs]

> So maybe I didn't know what RAILS_ROOT is above.
> Is that the directory set up by gem install radiant,
>     /usr/lib/ruby/gems/1.8/gems/radiant-0.6.2
> Or is that the directory set up by running "radiant --database postgresql myproject" ?
>
>   
The latter.  RAILS_ROOT points to your Radiant project, RADIANT_ROOT 
points to the Radiant core source files, whether in the gem or in 
vendor/radiant of your project.

Sean