Allow authentication header to not have to specify 'token=' key.

Fixes: https://github.com/rails/rails/issues/17108.
Allow habtm class_name option to be consistent with other associations
Update to Unicode 7.0.0

7.0.0 was released on June 16, 2014

http://unicode-inc.blogspot.com.ar/2014/10/unicode-version-70-complete-text-of.html

ruby bin/generate_tables
Don't let #{application,framework,full}_trace be nil

Those three can be nil when exception backtrace is nil. This happens and
that forced a couple of nil guards in the code. I'm proposing to make
those always return an array, even on nil backtrace.
[CI SKIP] Missing space.
Merge pull request #17636 from gsamokovarov/exception-wrapper-less-nils

Don't let #{application,framework,full}_trace be nil
Merge pull request #17635 from tgxworld/missing_space

[ci skip] Missing space in Active Job guide for referring to Action Mailer
add Nokogiri to docs generation guides
Rename #source_extract to #source_extracts in ExceptionWrapper

It returns multiple source extracts since 1ed264bc. Also cleaned its
result structure, as we no longer need the file in a code extract.
Merge pull request #17637 from gregmolnar/docs

add Nokogiri to docs generation guides [ci skip]
Don't show full trace on routing errors

Since dbcbbcf2bc58e8971672b143d1c52c0244e33f26 the full trace is shown
by default on routing errors. While this is a nice feature to have, it
does take the attention off the routes table in this view and I think
this is what most of the people look for in this page.

Added an exception to the default trace switching rule to remove that
noise.
Don't double check trace origin in  ExceptionWrapper#traces

If a trace isn't an application one, then it comes from a framework.
That's the definition of framework trace. We can speed up the traces
generation if we don't double check that.
Skip spring install in Cygwin due to fork() bad support.

See also: https://www.cygwin.com/faq.html#faq.using.fixing-fork-failures
Merge pull request #17638 from gsamokovarov/focus-application-trace

Don't show full trace on routing errors
Merge pull request #17639 from gsamokovarov/faster-exception-wrapper-traces

Don't double check trace origin in ExceptionWrapper#traces
Merge pull request #17630 from gsamokovarov/exception-wrapper-source-extract

Rename #source_extract to #source_extracts in ExceptionWrapper
Fix for assigns(:..) resetting template assertions

When calling assigns(:...) or cookies(:...), template assertions would be reset, which they obviously shouldn't be.
PERF: optimise type lookup to avoid invoking procs
Minor English fixes in docs [ci skip]
Revert "Merge pull request #16622 from matthewd/default-debug"

This reverts commit 2602a49a8600ab52f807599bbd5b1f9c0be4214f, reversing
changes made to 5d7c1057684c377bc2801c8851e99ff11ab23530.

The explicit default was introduced in 21f6d72, so apps created with Rails < 4
have the commented out version, which means that this change would break those
apps.