add ruby version 2.3

add ruby version 2.3

`make test-all` results:
https://gist.github.com/Azolo/521711c5340d2c492495b6d4eb0478b1

Author: Azolo

config/ruby_installer.rb

@@ -15,7 +15,7 @@ module RubyInstaller
       :file => 'cacert.pem'
     )
 
-    BaseVersions = %w(18 19 20 21 22)
+    BaseVersions = %w(18 19 20 21 22 23)
 
     Ruby18 = OpenStruct.new(
       :number  => "18",
@@ -178,6 +178,35 @@ module RubyInstaller
       :installer_guid_x64 => "{A98E44F8-6401-400F-830E-B1A2919C22BD}"
     )
 
+    Ruby23 = OpenStruct.new(
+      :number  => "23",
+      :version => "2.3.0",
+      :short_version => 'ruby23',
+      :url => "http://cache.ruby-lang.org/pub/ruby/2.3/",
+      :checkout => 'http://svn.ruby-lang.org/repos/ruby/branches/ruby_2_3',
+      :checkout_target => 'downloads/ruby_2_3',
+      :target => 'sandbox/ruby_2_3',
+      :doc_target => 'sandbox/doc/ruby23',
+      :build_target => 'sandbox/ruby23_build',
+      :install_target => 'sandbox/ruby23_mingw',
+      :patches => 'resources/patches/ruby23',
+      :configure_options => [
+        '--enable-shared',
+        '--disable-install-doc',
+        'debugflags=-g',
+        "CPPFLAGS='-DFD_SETSIZE=2048'"
+      ],
+      :files => [
+        "ruby-2.3.0.tar.bz2"
+      ],
+      :dependencies => [
+        :ffi, :gdbm, :openssl, :yaml, :zlib, :tcl, :tk
+      ],
+      :excludes => [],
+      :installer_guid => "{FF67D821-E2CA-4B2A-871F-4624C567AAF7}",
+      :installer_guid_x64 => "{96A4CEEE-5ACC-4FB2-AAB6-8152D5AB0C9E}"
+    )
+
     # COMPAT mode for Ruby 1.9.2
     if ENV['COMPAT'] then
       Ruby19.version = "1.9.2-p290"
@@ -206,7 +235,8 @@ module RubyInstaller
         Ruby19 => '{17E73B15-62D2-43FD-B851-ACF86A8C9D25}',
         Ruby20 => '{73A045D3-1C69-4885-B055-A5379CC7E603}',
         Ruby21 => '{04C58EFB-39FF-42E8-ADA1-3F588D2F2E10}',
-        Ruby22 => "{245A7D99-7BDE-4CC7-A872-63E47C73174B}"
+        Ruby22 => "{245A7D99-7BDE-4CC7-A872-63E47C73174B}",
+        Ruby23 => "{E5385270-5AEF-462F-BEA0-27F72897E2A4}",
       }.each do |k, v|
           k.patches = nil
           k.target = File.expand_path(ENV['LOCAL'].gsub('\\', File::SEPARATOR))
@@ -235,6 +265,7 @@ module RubyInstaller
         Ruby20.dependencies.delete(pkg)
         Ruby21.dependencies.delete(pkg)
         Ruby22.dependencies.delete(pkg)
+        Ruby23.dependencies.delete(pkg)
       end
     end