Fixed two syntax errors in postgres QueryGenerator (removed 2 unneeded commas).

lib/dialects/postgres/query-generator.js

@@ -62,7 +62,7 @@ module.exports = (function() {
 
       var values  = {
         table: QueryGenerator.addQuotes(tableName),
-        attributes: attrStr.join(", "),
+        attributes: attrStr.join(", ")
       }
 
       var pks = primaryKeys[tableName].map(function(pk){
@@ -192,7 +192,7 @@ module.exports = (function() {
       for (var attributeName in attributes) {
         attrString.push(Utils._.template('<%= before %> TO <%= after %>')({
           before: QueryGenerator.addQuotes(attrBefore),
-          after:  QueryGenerator.addQuotes(attributeName),
+          after:  QueryGenerator.addQuotes(attributeName)
         }))
       }