merge revision(s) r45374: [Backport #8405]

	* lib/csv.rb: Fixed a broken regular expression that was causing
	  CSV to miss escaping some special meaning characters when used
	  in parsing.
	  Reported by David Unric
	  [ruby-core:54986] [Bug #8405]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@45476 b2dd03c8-39d4-4d8f-98ff-823fe69b080e