fixed typo

lib/dialects/postgres/query-generator.js

@@ -202,8 +202,8 @@ module.exports = (function() {
             tableNames.push(_tableName)
             optAttributes = optAttributes.concat(
               Utils._.keys(dao.attributes).map(function(attr) {
-                var identifer = [_tableName, Utils.addTicks(attr)]
-                return identifer.join('.') + ' AS ' + Utils.addTicks(identifer.join('.'))
+                var identifier = [_tableName, Utils.addTicks(attr)]
+                return identifier.join('.') + ' AS ' + Utils.addTicks(identifier.join('.'))
               })
             )
           }