Upgrade libyaml to version 0.1.5
Upgrade Ruby 1.9.3 to patchlevel 545

Results of 'make check':

    ruby 1.9.3p545 (2014-02-24) [i386-mingw32]
    10628 tests, 1912569 assertions, 0 failures, 0 errors, 96 skips
Upgrade Ruby 2.0.0 to patchlevel 451

Results of 'make check':

https://gist.github.com/luislavena/9201327
Update History for release
Upgrade libyaml to version 0.1.6
Use encoding magic comment to workaround codepages

There are problems with different codepages (`chcp`) that causes `dk.rb` not to work properly.

Use a magic comment to mark the script as `UTF-8` in an attempt to workaround those issues.

Ref #199.
Merge remote-tracking branch 'origin/master' into feature/ruby-trunk