Update src21/src21railsexpress to MRI 2.1.5, Rubygems 2.4.4, and Bundler 1.7.6
Merge pull request #233 from jarinudom/mri-2.1.5

Update src21/src21railsexpress to MRI 2.1.5, Rubygems 2.4.4, and Bundler 1.7.6