rdiscount Windows compatibility

[nlloyds]

The latest ActiveJS uses rdiscount in the build process for Markdown
support. rdiscount is known not to run on Windows platforms, so the
default build will not work on Windows.

I have access to Mac and Linux systems so it's no big deal, but this
library is only used in the website step, so rdiscount should not be
loaded unless the website step is requested.

I'll work on a solution to this if I have time, but another +1 on
using Rake for the build (that's +2 total from me :)

Should this filed as a bug or documented somewhere?

Thanks,

Nathan