Wiss create event

![image](https://cloud.githubusercontent.com/assets/8709555/4948605/c4537e7c-660f-11e4-958d-93d1710930ac.png)


<!---
@huboard:{"order":5.960464477539062e-07,"milestone_order":1,"custom_state":""}
-->

why send insertId if no one uses it.
also check if err exists and return a valid err in case like
`err ? new DatabaseError(err) : null`