Revert "Uses gon for bootstrapping data"

This reverts commit 8779dd953702a76aa475a89213771b679529ab0b.
Revert "Sets the root of the application to application#index"

This reverts commit 42f1af8b9b74db993eb77a2a69f79f55c7ec39c2.
Creates an example user instance in users#show and its corresponding json.rabl file