Substitute tabs with two spaces

Hi @ohenrik!

I noticed that your code was [sort of all over the place](https://github.com/ohenrik/imagesite/blob/master/app/controllers/application_controller.rb) when I read it on GitHub. This usually happens if your editor prefers hard tabs instead of soft tabs (i.e. spaces), which causes a mismatch with the code generated by Ruby on Rails.

I hope you don't mind that I ran it through `$ for i in **/*.rb; expand -t 2 $i > /tmp/e; mv /tmp/e $i;`, which substitutes hard tabs with soft tabs as per the [Ruby style guide](https://github.com/bbatsov/ruby-style-guide#source-code-layout). If you merge the pull request, you will also want to configure your editor to use soft tabs with two spaces.

Happy thursday!

![weekend](https://cloud.githubusercontent.com/assets/195266/4841766/2e1e109e-601e-11e4-89c4-be4579678671.jpeg)