add Makefile for regenerating grammar
add Makefile for regenerating grammar

mikfreedman/spiff,mandelsoft/spiff,cloudfoundry-incubator/spiff,actionjack/spiff,mandelsoft/spiff,actionjack/spiff,geofffranks/spiff,rsliang/spiff,mikfreedman/spiff,rsliang/spiff,geofffranks/spiff,cloudfoundry-incubator/spiff