Update github raw urls

https://developer.github.com/changes/2014-04-25-user-content-security/
Merge pull request #222 from wouterw/patch-1

Update github raw urls
Automatically create laptopped vagrant boxes.

Vagrant boxes can be created automatically after a successful run of the
laptop test suite. These vagrant boxes are published to
[vagrantcloud](http://vagrantcloud.com/thoughtbot/) and should be a
solid start on a vagrant dev box suitable for modern ruby and
ruby-on-rails development.

Improvements include:

* Vagrantfiles fixed to have predictable names
* test/runner.sh now knows how to publish a box to s3
* Secrets for publishers extracted into ~/.laptop.secrets
* Error reporting improvements
* Full documentation on creating new base boxes

We now require vagrant >= 1.5.0 to use the automated test suite built
into laptop.
Separate publishing from testing
Extract common test bash functions. Extract s3 publishing