merge revision(s) r36583, r36458, r36414, r36103, r35690, r35681, r35658, r35657, r35655, r35492: [Backport #6815]

    * ext/psych/lib/psych.rb: updated to released version.

    * ext/psych/psych.gemspec: ditto

    * ext/psych/emitter.c (initialize): allow a configuration object to be
      passed to the constructor so that mutation isn't required after
      instantiation.

    * ext/psych/lib/psych/handler.rb: add configuration object

    * ext/psych/lib/psych/visitors/emitter.rb: use configuration object if
      extra configuration is present.

    * ext/psych/lib/psych/visitors/to_ruby.rb: strings with YAML anchors
      are properly referenced. Patched by Joe Rafaniello via Github:
        https://github.com/tenderlove/psych/pull/69
    * ext/psych/lib/psych/visitors/yaml_tree.rb: ditto
    * test/psych/test_alias_and_anchor.rb: test for change

    * ext/psych/lib/psych.rb: bumping psych to 1.3.3
    * ext/psych/psych.gemspec: ditto

    * ext/psych/extconf.rb: Use an exception instaed of bare abort.

    * ext/psych/parser.c (transcode_string): fix encoding index names.
      Thanks markizko for reporting.

    * ext/psych/lib/psych/visitors/to_ruby.rb: fix a bug with string
      subclass dumping and loading.

    * test/psych/test_array.rb: pertinent tests

    * test/psych/test_string.rb: ditto

    * ext/psych/lib/psych/visitors/to_ruby.rb: convert omap tagged maps to
      Psych::Omap objects rather than hashes. [Bug #6425]

    * test/psych/test_omap.rb: pertinent test.

    * ext/psych/lib/psych/visitors/yaml_tree.rb: keep a reference to
      custom coders so that GC does not impact dumped yaml reference ids.

    * ext/psych/lib/psych/json/yaml_events.rb: implicit styles should not
      be changeable for JSON events.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@36654 b2dd03c8-39d4-4d8f-98ff-823fe69b080e