fix error and verbose logging for windows services (#14)
fix error and verbose logging for windows services (#14)

or any process that doesn't have stdout/stderr.

by default, stderr is added to the error writes. and in case of
verbose, stdout is added.  added to an io.MultiWriter.  however,
the multiwriter stops writing on first error.  processes (such as
windows services, at least those created using github.com/judwhite/go-svc)
don't have stdout/stderr, and writes will fail.  and that logging
will never end up in the windows event logger.

an better fix would be to not use io.MultiWriter, but create a new
multiwriter that continues on failures.
google/logger