"The source :rubygems is deprecated because HTTP requests are insecure."

"Please change your source to 'https://rubygems.org' if possible, or 'http://rubygems.org' if not."
bundle up
Simply call Bundler.require
rails4: "RuntimeError: You should not use the `match` method in your router without specifying an HTTP method."
No such middleware
AC page caching had been extracted to a gem
assert_block was removed from Minitest
Missing html_safe calls