New version of BrainBuster - logic captcha for Rails

hiya

I've updated BrainBuster to 0.6 - changes:

* change naming to follow 1.2 -> ie "BrainBusterMixin" became "BrainBustersHelper" * 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