Errors unhandled in ORM

Another dev I'm working with ended up hunting for half-an-hour looking for a reason why an activity wasn't triggering as expected, turns out there was a typo in the field.

However, definitely something avoidable if errors were accessible from the mongoose hooks. Right now they end up unhandled:

stream-node-orm/src/backends/mongoose.js

Lines 104 to 108 in 14ca95f

    
           doc.populate(paths, function(err, docP) { 
        
           	if (docP.wasNew) { 
        
           		stream.FeedManager.activityCreated(docP); 
        
           	} 
        
           });

Thanks for the report.

	doc.populate(paths, function(err, docP) {
	if (docP.wasNew) {
	stream.FeedManager.activityCreated(docP);
	}
	});