atomic_write rescue also Errno::EACCES

atomic_write rescue also Errno::EACCES on changing file permission. It could be raised with some type of filesystem
Add regression test for router was overwriting PATH_INFO

[related #17233]
Default generated Gemfile to coffee-rails ~> 4.1.0
Merge pull request #17241 from josh/coffee-rails-4-1

Upgrade to coffee-rails 4.1.0
Replace Enumerable#reverse.each with Enumerable#reverse_each
Replace Array#shuffle.first with Array#sample
Start running railties builds first, since they take the longest finish
Merge pull request #17244 from sferik/reverse_each

Replace Enumerable#reverse.each with Enumerable#reverse_each
Merge pull request #17245 from sferik/sample

Replace Array#shuffle.first with Array#sample
Merge pull request #17246 from sferik/railties_first

Start running railties builds first, since they take the longest finish
Merge pull request #17234 from arthurnn/add_regression_for_path_and_cascade

Add regression test for router was overwriting PATH_INFO
fix test_helper for mountable plugin
Merge pull request #17240 from masarakki/fix-test_helper-of-mountable-plugin

fix test_helper for mountable plugin
remove unused tools/profile
Merge pull request #17247 from igas/fix-deprecations

remove unused tools/profile

We usually use moderns tools like benchmark-ips so we don't need this anymore
Merge pull request #17230 from robertoz-01/master

atomic_write rescue also Errno::EACCES
Revert "Merge pull request #17247 from igas/fix-deprecations"

This reverts commit 997f1575f78bf6a2d12b8665a55807d51fe964df, reversing
changes made to f919d5f5ea75f0e56a57643e5a0472367a98625f.

See https://github.com/rails/rails/pull/17247#issuecomment-58895078
Document the propose of tools/profile
Do not use deprecated `exists?` method
Make a note about the internal tools/ dir and what each utility does