Add spork from tutorial github
bundle install with spork added, new lock & binstubs
bootstrapped spork

bin/spork --bootstrap
move environment loading into prefork for spork
New binstubs from rails (again?)

the message
-----------
Looks like your app's ./bin/rails is a stub that was generated by Bundler.

In Rails 4, your app's bin/ directory contains executables that are versioned
like any other source code, rather than stubs that are generated on demand.

Here's how to upgrade:

  bundle config --delete bin    # Turn off Bundler's stub generator
  rake rails:update:bin         # Use the new Rails 4 executables
  git add bin                   # Add bin/ to source control
added guard-spork to gem list to fix notifier