Document VAGRANT_SPEC_ARGS option for running tests
Document VAGRANT_SPEC_ARGS option for running tests

chrisroberts/vagrant,sni/vagrant,marxarelli/vagrant,mitchellh/vagrant,mitchellh/vagrant,sni/vagrant,chrisroberts/vagrant,chrisroberts/vagrant,marxarelli/vagrant,marxarelli/vagrant,mitchellh/vagrant,chrisroberts/vagrant,sni/vagrant,sni/vagrant,mitchellh/vagrant,marxarelli/vagrant