Add RuleBuilder

[soroshsabz]

ITNOA

This builder help us to more easier make rule

resolves #28

[soroshsabz]

@splitice please review it

[splitice]

I think if a rule builder is a good idea it should have some advantage over using the regular interface. Perhaps that it doesnt rely on .Parse. Building soimething however that was reasonably comprehensive (how would modules be handled?) could be a big undertaking.