Rules executor

Issue Summary

I've scratched an itch, and got some code that allows me to 'render' the results of a view into a rule set. Basically I get to match up fields from my view, nids, cids, uids with the arguments of a rule set. Executing the view then executes the rule set on each row of the view. I think this could be really, really powerful.

The idea being that you could then schedule a view to be executed say, every day, e.g. closing issues that are marked as fixed, or emailing owners of nodes about how their auctions are going, whatever really.

I've called this code rules_executor, but I'm not really sure what to do with it, I'm happy for it to be integrated into the rules module here on d.o (but would want commit access obviously) or I can create a new project for it, if you feel it's outside the scope of what the rules module on d.o. is trying to provide.

I need some feedback as to where I should put the code!