Turn off noisy RSpec warnings

https://github.com/everydayrails/rails-4-1-rspec-3-0/issues/13
Merge branch '02_setup' into 03_models
Merge branch '03_models' into 04_factories
Fix typo in contact_spec descriptions

https://github.com/everydayrails/rails-4-1-rspec-3-0/issues/4
Merge branch '04_factories' into 05_controller_basics
Use not_to for consistency with book and RSpec documentation

https://github.com/everydayrails/rails-4-1-rspec-3-0/issues/3
Merge branch '05_controller_basics' into 06_advanced_controllers

Conflicts:
  spec/controllers/contacts_controller_spec.rb
    Make sure examples match what is in the book
Change usage of to_not to not_to in chapter 6 code sample
Merge branch '06_advanced_controllers' into 07_controller_cleanup

Conflicts:
	spec/controllers/contacts_controller_spec.rb
Merge branch '07_controller_cleanup' into 08_features
Replace to_not with not_to in feature specs
Use standard DatabaseCleaner configuration
Merge branch '08_features' into 09_speedup

Conflicts:
	spec/controllers/contacts_controller_spec.rb
Replace usage of 'should' in Shoulda examples