bump version to 2.1.1


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@44442 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2013-12-27

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_1@44443 b2dd03c8-39d4-4d8f-98ff-823fe69b080e