Ruby 2.1.2 is Released

Full list of changes: http://svn.ruby-lang.org/repos/ruby/tags/v2_1_2/ChangeLog

This release contains a fix for a regression of Hash#reject in Ruby 2.1.1, support for build with Readline-6.3 (see Bug #9578), an updated bundled version of libyaml with psych, and some bug fixes.