[3.6.2_automate_test_guard] Add guard, and bundle install.
[3.6.2_automate_test_guard] Run ``bundle exec guard init rspec``.
[3.6.2_automate_test_guard] Setup guardfile according to the tutorial.
Merge branch '3.6.2_automate_test_guard'
[3.6.3_spork] bundle install & bundle exec spork --bootstrap.
[3.6.3_spork] Revise the spec/spec_helper.rb file following tutorial.
[3.6.3_spork] Add --drb.
[3.6.3_spork] Modify Guardfile to adopt spork.
Merge branch '3.6.3_spork'