Update app.js
Update app.js

Added jslint node.js statement and var prefix to cleanup JazzHub editor view of source code.
ibmjstart/bluemix-node-mysql-uploader,ibmjstart/bluemix-node-mysql-uploader,cgvarela/bluemix-node-mysql-uploader,carnell69/bluemix-node-mysql-uploader,alperg/bluemix-node-mysql-uploader,cgvarela/bluemix-node-mysql-uploader,alperg/bluemix-node-mysql-uploader,carnell69/bluemix-node-mysql-uploader