Vendor dependencies

Let's see how I like this workflow.

vendor/tempdir/README.md

@@ -0,0 +1,62 @@
+tempdir
+=======
+
+A Rust library for creating a temporary directory and deleting its entire
+contents when the directory is dropped.
+
+[![Build Status](https://travis-ci.org/rust-lang-nursery/tempdir.svg?branch=master)](https://travis-ci.org/rust-lang-nursery/tempdir)
+[![Build status](https://ci.appveyor.com/api/projects/status/2mp24396db5t4hul/branch/master?svg=true)](https://ci.appveyor.com/project/rust-lang-libs/tempdir/branch/master)
+
+[Documentation](https://doc.rust-lang.org/tempdir)
+
+## Deprecation Note
+
+The `tempdir` crate is being merged into [`tempfile`](https://github.com/Stebalien/tempfile). Please see [this issue](https://github.com/Stebalien/tempfile/issues/43) to track progress and direct new issues and pull requests to `tempfile`.
+
+## Usage
+
+Add this to your `Cargo.toml`:
+
+```toml
+[dependencies]
+tempdir = "0.3"
+```
+
+and this to your crate root:
+
+```rust
+extern crate tempdir;
+```
+
+## Example
+
+This sample method does the following:
+
+1. Create a temporary directory in the default location with the given prefix.
+2. Determine a file path in the directory and print it out.
+3. Create a file inside the temp folder.
+4. Write to the file and sync it to disk.
+5. Close the directory, deleting the contents in the process.
+
+```rust
+use std::io::{self, Write};
+use std::fs::File;
+use tempdir::TempDir;
+
+fn write_temp_folder_with_files() -> io::Result<()> {
+    let dir = TempDir::new("my_directory_prefix")?;
+    let file_path = dir.path().join("foo.txt");
+    println!("{:?}", file_path);
+
+    let mut f = File::create(file_path)?;
+    f.write_all(b"Hello, world!")?;
+    f.sync_all()?;
+    dir.close()?;
+
+    Ok(())
+}
+```
+
+**Note:** Closing the directory is actually optional, as it would be done on
+drop. The benefit of closing here is that it allows possible errors to be
+handled.