Configurable package repository location

Thanks for this great cookbook.

I just wanted to get TeamCity downloads from a different location (a shared folder mounted on the filesystem) and so I've written this. The README.md is updated with the details.

I have tested using the default http:// location and a file:// location.

I have also bumped the version according to the [Semantic Versioning](http://semver.org/) specification. Feel free to rollback this version bump if you like.