Formatting changes to conform to the new Elm style guide.

The Elm style guide is a work in progress:
https://gist.github.com/laszlopandy/c3bf56b6f87f71303c9f

I am using this repository to test how it looks on real code.
@evancz 
Fixed in https://github.com/prezi/assessment-elm-image-search/pull/2