Added all the new HTML5 form types as individual form tag methods (search, url, number, etc) (Closes #3646) [Stephen Celis]

Signed-off-by: NJosé Valim <jose.valim@gmail.com>

It seems the test directory backtrace line is output with a / before it, thereby previously making it not match the regex. Support APP_DIRS that have backtrace lines maybe beginning with /. [#4277 state:resolved]
Signed-off-by: NJosé Valim <jose.valim@gmail.com>

moves Object#singleton_class to Kernel#singleton_class to match Ruby also there, same for #class_eval to simplify, and adds coverage for class_eval

Rename config.cookie_secret to config.secret_token and pass it as configuration in request.env. This is another step forward removing global configuration.

Was not tested.

This reverts commit a8c3c71a.

Signed-off-by: NJeremy Kemper <jeremy@bitsweat.net>

[#2627 state:committed]
Signed-off-by: NJeremy Kemper <jeremy@bitsweat.net>