stdin/stdout handling, additional signature for foo.service()

Now handles stdin/stdout (ngmin f1 f2 -o out | cat *.js |ngmin | cat >out.js)
Doesn't require angular.module() anymore, can also be fooApp.service()
Merge branch 'master' of https://github.com/anjo/ngmin

Conflicts:
	main.js
	signature.js