* update nodename method to not use regex anymore
* update readme with 2 new columns for the exit code table
We used quite the broad regex to parse the nodename from the status
string. But we relied on a single quote to mark the starting point.
It seems some distributions don't have this starting quote,
therefore breaking the api.
* add default logging NullHandler
* fix indentation mismatch
* rename control to calls to better point out its purpose
* rename class to EjabberdApiCalls to better point out it purpose
* changed get_nodes to an internal support method