correctly escape backslashes in request path globs

make sure that unreadable files are also not leaked

CVE-2014-7829
Preparing for 4.1.7.1 release
Merge branch '4-1-7-1' into 4-1-stable

Conflicts:
	RAILS_VERSION
	actionmailer/lib/action_mailer/gem_version.rb
	actionpack/lib/action_pack/gem_version.rb
	actionview/lib/action_view/gem_version.rb
	activemodel/lib/active_model/gem_version.rb
	activerecord/lib/active_record/gem_version.rb
	activesupport/lib/active_support/gem_version.rb
	railties/lib/rails/gem_version.rb
	version.rb
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