Merge branch 'new-script' into 'master'

Add a script to show the branches and commit hashes of some recipe source

See merge request redox-os/redox!1414

scripts/commit-hash.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+
+if [ $# -ne 1 ]
+then
+    echo "Usage: $0 recipe_name"
+    echo "  Print the commit hash for recipe_name"
+    exit 1
+fi
+
+cd cookbook
+recipe_path="$(target/release/find_recipe $1)"
+
+cd "$recipe_path"/source
+git branch -v