Make merge_pull_request.pl default to parrot.git, but allow other repos to be specified
Make merge_pull_request.pl default to parrot.git, but allow other repos to be specified

tkob/parrot,gitster/parrot,youprofit/parrot,tkob/parrot,parrot/parrot,gitster/parrot,youprofit/parrot,gagern/parrot,gitster/parrot,gagern/parrot,gagern/parrot,FROGGS/parrot,youprofit/parrot,tkob/parrot,youprofit/parrot,parrot/parrot,FROGGS/parrot,gagern/parrot,gagern/parrot,youprofit/parrot,youprofit/parrot,FROGGS/parrot,gagern/parrot,gitster/parrot,tkob/parrot,tkob/parrot,FROGGS/parrot,FROGGS/parrot,parrot/parrot,tkob/parrot,FROGGS/parrot,tkob/parrot,gitster/parrot,youprofit/parrot,youprofit/parrot,gagern/parrot,parrot/parrot,FROGGS/parrot,FROGGS/parrot,gitster/parrot,tkob/parrot,parrot/parrot,gitster/parrot