Makes CI builder install --pre version of Bundler, now that bundle install works again

ci/ci_build.rb

@@ -19,9 +19,9 @@ def rake(*tasks)
 build_results = {}
 
 # Install required version of bundler.
-#bundler_install_cmd = "gem install bundler --no-ri --no-rdoc"
-#puts "Running command: #{bundler_install_cmd}"
-#build_results[:install_bundler] = system bundler_install_cmd
+bundler_install_cmd = "sudo gem install bundler --pre --no-ri --no-rdoc"
+puts "Running command: #{bundler_install_cmd}"
+build_results[:install_bundler] = system bundler_install_cmd
 
 cd root_dir do
   puts