Vendor dependencies

Let's see how I like this workflow.

vendor/core-foundation-sys/src/lib.rs

@@ -0,0 +1,32 @@
+// Copyright 2013-2015 The Servo Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+#![allow(non_snake_case, non_camel_case_types, non_upper_case_globals, improper_ctypes)]
+
+#![cfg_attr(all(feature="mac_os_10_7_support", feature="mac_os_10_8_features"), feature(linkage))] // back-compat requires weak linkage
+
+pub mod array;
+pub mod attributed_string;
+pub mod base;
+pub mod bundle;
+pub mod characterset;
+pub mod data;
+pub mod date;
+pub mod dictionary;
+pub mod error;
+pub mod filedescriptor;
+pub mod messageport;
+pub mod number;
+pub mod propertylist;
+pub mod runloop;
+pub mod set;
+pub mod string;
+pub mod timezone;
+pub mod url;
+pub mod uuid;
+pub mod mach_port;