Import bigdecimal version 1.3.0.pre. The full commit log of this changes can be found at: https://github.com/ruby/bigdecimal/compare/5c43a9e...v1.3.0.pre git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57040 b2dd03c8-39d4-4d8f-98ff-823fe69b080e