merge revision(s) 39208:

	* ext/json: merge JSON 1.7.7.
	  This includes security fix. [CVE-2013-0269]
	  https://github.com/flori/json/commit/d0a62f3ced7560daba2ad546d83f0479a5ae2cf2
	  https://groups.google.com/d/topic/rubyonrails-security/4_YvCpLzL58/discussion


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@39215 b2dd03c8-39d4-4d8f-98ff-823fe69b080e