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.

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

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

Signed-off-by: Nwycats <wycats@gmail.com>

guides: warn about edge guides at the top of the home preamble, and mention that only for edge guides, stable guides need no warning

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

Fixed unescaped '<' and '>' chars on getting_started section that were causing w3c validation errors (plusplus textile extension was letting them go untextilized)

Fixed chapter list generation on index section, an empty pair of <ul></ul> was being created when the chapters had no children.

guides: rewrites index and credit pages as pure HTML to avoid textilizing the rendered view, in particular we can now put a DOCTYPE in the layout