Use a structured logging context to accumulate messages

Defer printing of them until the end
Update Godeps
bump version
slog godep
Update
Namespace errors
No need to wrap this in a func()
Need to wrap this in a func()

Otherwise time.Since(start) get's evaled. For some reason I though that
it wouldn't.
Let the FixerFunc handle it's own timing
Bump slog and use MeasureSince