bin:gr: add helper to for r in `git remote`; do ...

Signed-off-by: Alejandro Mery <amery@geeks.cl>

files/bin/gr

@@ -0,0 +1,15 @@
+#!/bin/sh
+
+if [ $# -eq 0 ]; then
+	cat >&2 <<-EOT
+	Usage: $0 <args...>
+
+	runs <args...> over every remote
+	EOT
+	exit 2
+fi
+
+for r in $(git remote); do
+	echo "== $r"
+	git remote "$r" "$@"
+done