Add rm_node to accessors to remove subnode instead of clearing them
Do not confine providers to the existence of target files
Shellvar: Add exported and unset as values for ensure
Shellvar: Fix converting unset entries into exported entries
Shellvar: manage un-unset and un-export cases
Shellvar: Remove unset entries on destroy
Shellvar: Use aug.clear instead of aug.touch for ruby-augeas 0.3.0 compatibility
Shellvar: add doc for exported/unset
Shellvar: Fix comments with unset
Add uncomment param to shellvar type
nrpe_command: simplify create
host: simplify create
Deactivate autosave when an exception is caught to avoid crashing the Augeas handler