Simplify and document Gemfile
Merge branch 'master' of https://github.com/colinthompson/sample_app
Test to ensure admin attribute is not accessible from raw patch request
Ensure user-specific links are not accessible when signed out
Clean and simplify tests
Refactor duplicated form code
Ensure friendly forwarding is only first time
Ensure admin users cannot destroy themselves
Ensure signed-in users cannot sign up