Removes the old error handling library and switches to plain
fmt.Errorf calls.
There are several reasons for this:
* There are no useful types or handling here anyways, so output format
is the only priority.
* Users don't care about getting stacktraces.
* My emotional wellbeing.
Fin de siècle.
This introduces support for looking up IP addresses using local DNS resolver.
Function will return a list of all IP addresses associated with hostname.
Further processing can be achieved using supported list template functions.
