[Radiant] Authentication again

[Josh French]

> does Radiant plays well with rails
> plugins?  I recall something about differences in the file structures
> creating incompatibilities.

Dan,

Rails plugins (or the majority of them) work just fine under Radiant.  
You can place them in vendor/plugins or vendor/extensions/.../vendor/ 
plugins. I like to keep a single copy of commonly used plugins such  
as attachment_fu, will_paginate, &c in the main vendor dir; plugins  
that only apply to specific extensions get bundled with that  
extension. This way I don't have multiple copies of the common  
plugins, and the weird one-offs don't get left behind when I'm moving  
custom extensions between projects.

Josh