Dynamically creating rules and compile directives

[denisdefreyne]

@majkinetor wrote in nanoc/nanoc#703:

I would like to generate Rules DSL from the helper module. I have custom blog helper and i would like it to generate RSS feeds automatically so I don't have to specify any compile and routing rules in the Rules file as long as specific metadata is present. That is, I want the hole thing to be pluggable by simple import and some metadata, without extensive manual setup.

For more details, please see my question on stackoverflow:

http://stackoverflow.com/questions/32645687/dynamically-creating-rules-and-compile-directives

Further discussion in nanoc/nanoc#703.