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>

Use a constant proc to generate ActionView::Template finalizers. For some strange reason, finalizers created via ActionView::Template.finalizer_for cause Template instances to leak on MRI.
Signed-off-by: Nwycats <wycats@gmail.com>

sanity check arguments in guides generation collapsed into a single WARNINGS flag, EDGE_GUIDES renamed to EDGE to be coherent with the rest, preamble revised

  ActionDispatch::Request rather than Rack::Request.

* Changed ActionDispatch::Request#method to return a String, to be
  compatible with the Rack::Request superclass.

* Changed ActionDispatch::Request#method to return the original
  method in the case of methodoverride and #request_method not to,
  to be compatible with Rack::Request

adds a preamble to the guides generator, documents what it does and the environment variables it supports