Optimize compareTo in Router to guarantee consistent behaviour.

[chickenlj]

router1.compareTo(router2);
and
router2.compareTo(router1);

should always give the same order.

[chickenlj]

compareTo in Router interface

@Override
    default int compareTo(Router o) {
        if (o == null) {
            throw new IllegalArgumentException();
        }
        if (this.getPriority() == o.getPriority()) {
            if (o.getUrl() == null) {
                return 1;
            }
            if (getUrl() == null) {
                return -1;
            }
            return getUrl().toFullString().compareTo(o.getUrl().toFullString());
        } else {
            return getPriority() > o.getPriority() ? 1 : -1;
        }
    }

compareTo in ScriptRouter

 @Override
    public int compareTo(Router o) {
        if (o == null || o.getClass() != ScriptRouter.class) {
            return 1;
        }
        ScriptRouter c = (ScriptRouter) o;
        return this.priority == c.priority ? rule.compareTo(c.rule) : (this.priority > c.priority ? 1 : -1);
    }

[lexburner]

I will fix this.