[chef] chef-runner v0.3.0

[Mathias Lafeldt < >]

Ohai Chefs!

chef-runner version 0.3.0 is out!

https://github.com/mlafeldt/chef-runner/blob/master/CHANGELOG.md#v030-jul-30-2014

The goal of this release is to "ssh all the things" in order to
support any system reachable over SSH. In addition to local Vagrant
machines, chef-runner can now provision remote machines like EC2
instances. To achieve this, I made the following changes:

* The argument passed to `-H` now has the format

 :port]`,
 allowing you to optionally change SSH user
and port. (Other SSH settings can be set via  `~/.ssh/config`.)

* rsync over SSH is used to transfer files to `/tmp/chef-runner` on
the target machine. chef-runner no longer depends on `/vagrant` being
mounted.

* With Vagrant, instead of running commands via `vagrant ssh`, feed
the output of `vagrant ssh-config` into OpenSSH. The same SSH
configuration is used to upload files with rsync.

Other changes:

* Introduce flexible driver concept (inspired by Test Kitchen). A
driver is responsible for running commands on and uploading files to a
machine using whatever mechanism is available. chef-runner currently
contains drivers for Vagrant and SSH, but more can -- and will -- be
added.

* Always transfer files with `rsync --compress` to speed things up.

* Remove Cucumber scenarios. They didn't add much value to the Go
tests and were *very* slow. Now Travis builds are much faster.

* More and better Go tests.

* More and better log messages.

* Option `-h` outputs more useful usage text (the one shown in the README).


Hope you enjoy this release!

-Mathias

PS: The next release will delight users of Test Kitchen. ;)