unique violation errors should be error objects

lib/dao.js

@@ -411,7 +411,7 @@ module.exports = (function() {
                   fields = fields.filter(function(f) { return f !== self.Model.tableName; })
                   fields = fields.filter(function(f) { return f !== self.Model.tableName; })
                   Utils._.each(self.__options.uniqueKeys, function(value, key) {
                   Utils._.each(self.__options.uniqueKeys, function(value, key) {
                     if (Utils._.isEqual(value.fields, fields) && !!value.msg) {
                     if (Utils._.isEqual(value.fields, fields) && !!value.msg) {
-                      err = value.msg
+                      err = new Error(value.msg)
                     }
                     }
                   })
                   })
                 }
                 }

lib/dialects/mysql/query.js

@@ -28,7 +28,7 @@ module.exports = (function() {
 
 
       if (err) {
       if (err) {
         err.sql = sql
         err.sql = sql
-        this.emit('error', err, this.callee)
+        this.emit('error', err)
       } else {
       } else {
         this.emit('success', this.formatResults(results))
         this.emit('success', this.formatResults(results))
       }
       }