Update forked OS X Homebrew install (using upstream origin)

brewup.sh

function brewup () {
	local BREW_PWD=`pwd`
	local BREW_PREFIX=`brew --prefix`
	local BREW_TAPS=$BREW_PREFIX/Library/taps
	cd $BREW_PREFIX
	echo "Update to latest git commit."
	git checkout master
	git fetch upstream
	git merge upstream/master
	git push origin master
	echo "Update all taps."
	for repo in `find $BREW_TAPS -type d -a -iname .git`
	do
		cd `dirname $repo`
		echo -n "`dirname $repo`: "
		git pull
	done
	cd $BREW_PWD;
	echo "Upgrade outdated packages."
	brew upgrade `brew outdated`
}