Set up error logging utility when in non-production mode

[sohkai]

Currently there's one usage of debug in aragon-wrapper, but the behaviour of this logging utility is meant more for servers and not frontend bundles (which usually enable logging by default and only turn it off through NODE_ENV=production).

There's a number of places in aragon-wrapper where errors are swallowed silently for lack of a better thing to do. Outside of giving clients more access to those errors (e.g. through an errors observable?), it'd still be nice to log them.