Merge pull request #4680 from tomhughes/validate-page-numbers

Add parameter validation to pagination

diff --cc Gemfile
Simple merge

diff --cc Gemfile.lock
Simple merge

diff --cc app/controllers/application_controller.rb
Simple merge

diff --cc app/controllers/changesets_controller.rb
Simple merge

diff --cc config/locales/en.yml
Simple merge

diff --cc config/routes.rb
Simple merge

diff --cc test/controllers/changesets_controller_test.rb
Simple merge

diff --cc test/controllers/notes_controller_test.rb
Simple merge

diff --cc test/controllers/users_controller_test.rb
Simple merge