Modified defaults.js to use process.env.USERNAME instead of process.env.USER as default value for user and database on Windows platforms

Author: Brar

lib/defaults.js

@@ -3,10 +3,10 @@ var defaults = module.exports = {
   host: 'localhost',
 
   //database user's name
-  user: process.env.USER,
+  user: process.platform === 'win32' ? process.env.USERNAME : process.env.USER,
 
   //name of database to connect
-  database: process.env.USER,
+  database: process.platform === 'win32' ? process.env.USERNAME : process.env.USER,
 
   //database user's password
   password: null,