Vendor dependencies

Let's see how I like this workflow.

vendor/xdg/README.md

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+rust-xdg
+========
+
+rust-xdg is a library that makes it easy to follow the X Desktop Group
+specifications.
+
+Currently, only [XDG Base Directory][basedir] specification is implemented.
+
+[basedir]: http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html
+
+Installation
+------------
+
+Add the following to `Cargo.toml`:
+
+```toml
+[dependencies]
+xdg = "^2.1"
+```
+
+Examples
+--------
+
+See [documentation](https://whitequark.github.io/rust-xdg/xdg/).
+
+License
+-------
+
+rust-xdg is distributed under the terms of both the MIT license
+and the Apache License (Version 2.0).
+
+See [LICENSE-APACHE](LICENSE-APACHE) and [LICENSE-MIT](LICENSE-MIT)
+for details.