rename this repo

[jessesanford]

The typical docker image git repository and subsequent dockerhub repository uses the project name as the repo name. This disambiguates things when using this image in dockerfiles that depend upon these repos. As it is now it is easy to mistake this repo as a fork of the Docker project repo (https://github.com/docker/docker) if you only have access to the path portion of the url.

[jbrooksuk]

Probably not, no. This is "CachetHQ Docker" as the org/repo name support.