Fix doc aug.label -> Augeas#label
Add augopen! method
Add apache_directive type and provider
No need for positionable (yet)
Add examples for apache_directive
apache_directive: fix resource_path with no args
apache_directive: Better validation of args_params
apache_directive: Add an args_params=0 to self.instances
apache_directive: cast args_params to integer for comparison
Add complex example for apache_directive