Adds console.trace to dropSync test helper

It's failing a lot in Travis and I want to see if it's something about
node v0.6 or just Travis...

Author: dresende

test/support/spec_helper.js

@@ -28,6 +28,9 @@ module.exports.dropSync = function (models, done) {
 		});
 	}, function (err) {
 		if (common.protocol() != 'sqlite') {
+			if (err) {
+				console.trace(err);
+			}
 			should.not.exist(err);
 		}
 		done(err);