bump version to 20170914

bump version to v20170726

bump version to 20170523

Merge pull request rbenv#1074 from yahonda/jruby919

Add JRuby 9.1.9.0 snapshot

Merge pull request rbenv#1067 from koic/add_definition_for_ruby_2_4_1

Add definition for Ruby 2.4.1

ruby-build 20170201

bump version to 20170112

Merge pull request rbenv#1039 from rbenv/240

added definition for Ruby 2.4.0

Merge pull request rbenv#1024 from rbenv/add-ruby233

Added definition of Ruby 2.3.3

Merge pull request rbenv#1019 from rbenv/update-latest-releases

Added 2.2.6 and 2.3.2 definitions