Homebrew recipe 498

Fixes #498 (with https://github.com/ClusterHQ/homebrew-flocker/pull/1)
I think you can just do this:
```
# Linux
$ sha1sum 0.1.0.tar.gz 
59f61aa85b44981fc3ea8ddb132628b9ee27d02e  0.1.0.tar.gz
```

```
# Mac OSX
$ shasum --algorithm=1 0.1.0.tar.gz 
59f61aa85b44981fc3ea8ddb132628b9ee27d02e  0.1.0.tar.gz
```