Removed module by default, removed double include, updated documentation
Added reference to instance rather than class.

Providing my assessment is correct it maybe more efficient to have `skip_resource_validation?` return the Proc in the first place.
Update README.md

Fixed typo.
Merge branch 'patch-1' into proc-fix
Merge branch 'proc-fix'

Conflicts:
	lib/validation_skipper.rb