Show the author's name on each commit.

There was already code to display this, but it was either buggy or
relied on an outdated API response format from GitHub.

There's now a smidgen of padding to the names to separate them from the
commit messages themselves.
Merge pull request #60 from alphagov/show-user

Show the author's name on each commit
Use SCSS imports in application's CSS file.

The asset pipeline's `require` statements don't allow us to `@extend`
Bootstrap mixins in our own rule definitions.
Merge pull request #61 from alphagov/de-pipelineify

Use SCSS imports in application's CSS file