Demonstrate the use of Java EE 7 features in TicketMonster

Features new to Java EE 7 should be demonstrated in the TicketMonster tutorial.

Some of these include:

• Java Batch (for bulk deletion of tickets via the bot, to avoid OOMEs through bursts in memory consumption).
• WebSockets and/or SSE (for displaying the section allocation charts - we should attempt to not use client-side polling)
• DataSource definition via annotations, so as to ensure ease in configuring and deploying the app without requiring prior datasource registration against JNDI.