New version of BrainBuster - logic captcha for Rails


I've updated BrainBuster to 0.6 - changes:

* change naming to follow 1.2 -> ie "BrainBusterMixin" became
* seperate out the filter
* seperate out the captcha credit into _captcha_footer partial
* move partials to a views folder, it makes more sense
* tweak css

details and download here:

- Rob