Allow exclusion of entire classes and modules
Add configuration section to README.md
Merge branch 'master' into entire-class

Conflicts:
	README.md
	config/flay.yml
	spec/unit/yardstick/config/for_rule_spec.rb
	spec/unit/yardstick/rule/class_methods/coerce_spec.rb
	spec/unit/yardstick/rule/enabled_predicate_spec.rb
	spec/unit/yardstick/rule/initialize_spec.rb
	spec/unit/yardstick/rule/validatable_predicate_spec.rb
Fix rubocop warnings