Fix https://github.com/onmodulus/demeteorizer/issues/70

@InconceivableDuck The issue was rooted in scraperjs' use of 'shoe', which has a bundled package with version '0.0.0-unreleasable'. Seems reasonable to broaden the existing exclusion of packages with version '0.0.0' to catch the new case as well. To make it generic, I just check to see if it starts with '0.0.0'.

Thanks.