initial rust support

var/spack/repos/builtin/packages/rust-bindgen/package.py

@@ -0,0 +1,13 @@
+from spack import *
+import os
+
+
+class RustBindgen(Package):
+    """The rust programming language toolchain"""
+    homepage = "http://www.rust-lang.org"
+    url = "https://github.com/crabtw/rust-bindgen"
+
+    extends("rust")
+
+    def install(self, spec, prefix):
+        cargo('install', '--root', prefix)