Vendor dependencies

Let's see how I like this workflow.

vendor/core-foundation-sys/Cargo.toml

@@ -0,0 +1,29 @@
+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g., crates.io) dependencies
+#
+# If you believe there's an error in this file please file an
+# issue against the rust-lang/cargo repository. If you're
+# editing this file be aware that the upstream Cargo.toml
+# will likely look very different (and much more reasonable)
+
+[package]
+name = "core-foundation-sys"
+version = "0.8.3"
+authors = ["The Servo Project Developers"]
+build = "build.rs"
+description = "Bindings to Core Foundation for macOS"
+homepage = "https://github.com/servo/core-foundation-rs"
+license = "MIT / Apache-2.0"
+repository = "https://github.com/servo/core-foundation-rs"
+[package.metadata.docs.rs]
+default-target = "x86_64-apple-darwin"
+
+[dependencies]
+
+[features]
+mac_os_10_7_support = []
+mac_os_10_8_features = []