It will make sure that the generated application in the tests get the
gem.

Many CVEs released: https://groups.google.com/forum/#!topic/ruby-security-ann/aSbgDiwb24s

I didn't mean to commit that!

"conditionals in the gemfile creates conditional code in the Gemfile.lock.
Since it is checked in the repository I think it is better to avoid it"

This picks up https://github.com/sparklemotion/nokogiri/pull/1218
which allows nokogiri to compile on Xcode-only OS X systems.

In listen 3.0.4 and below, the `#stop` method on the notification
backends are a no-op, meaning that we are leaking them per test. This
ended up triggering another bug in Ruby that causes our builds to fail
randomly on CI.

listen bug: https://github.com/guard/listen/issues/353
ruby bug: https://bugs.ruby-lang.org/issues/11744

3.0.3 has a bug in OS X.

This is the implementation of the file update checker written
by Puneet Agarwal for GSoC 2015 (except for the tiny version
of the listen gem, which was 3.0.2 in the original patch).

Puneet's branch became too out of sync with upstream. This is
the final work in one single clean commit.

Credit goes in the first line using a convention understood
by the contrib app.

* Don't deep-require to AD::Http::Request since it misses Mime autoload

Use the methods rack provides so we don't have to worry about the exact
header key.

Rack implements the Etag header manipulation methods, so we can use
those instead of ours.

* Introduce `ActionDispatch::Http::Headers#add` to add a value to
  a multivalued header.
* Move `Response#add_header` upstream: https://github.com/rack/rack/pull/957
* Match upstream `Response#have_header?` -> `#has_header?` name change.

YAGNI concurrent-ruby master branch now that 1.0.0.pre3 is released with fixes for warnings and circular require

Bumped version of concurrent-ruby to 1.0.0.pre3, which fixes all
interpreter warnings.

* Move `app/assets/manifest.js` to `app/assets/config/manifest.js`.
  Avoid the suggestion that you can/should deep-link `stylesheets/foo`.
* Pull in all toplevel stylesheets and JavaScripts, not just
  `application.js` and `.css`. Demonstrate how to use `link_directory`
  with a specified `.js`/`.css` type.
* Fix RAILS_ENV handling in assets tests.
* Shush warnings spam from third-party libs that distract from tests.

Since `alias_method_chain` is deprecated we need to use the master version
of the Turbolinks gem as it has support for using `Module#prepend`.

The thread_safe gem is being deprecated and all its code has been merged
into the concurrent-ruby gem. The new class, Concurrent::Map, is exactly
the same as its predecessor except for fixes to two bugs discovered
during the merge.

This will make the Gemfile.lock be dirty in some environments

Ruby 2.2.3 in windows need nokogiri 1.6.7.rc3 as it's the only version having correct pre-compiled so