merge revision(s) r45453,r45455,r45577: [Backport #9798]

	* ext/psych/lib/psych.rb: Merge psych-2.0.5. bump version to
	  libyaml-0.1.6 for CVE-2014-2525.

	* ext/psych/yaml/config.h: ditto.

	* ext/psych/yaml/scanner.c: ditto.

	* ext/psych/yaml/yaml_private.h: ditto.

	* ext/psych/psych.gemspec: update gemspec for psych-2.0.5


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@45812 b2dd03c8-39d4-4d8f-98ff-823fe69b080e