Java 11 Upgrade

* Fixed travis build config

JDK/Spring Upgrades

Upgraded to:

* Java 11
* Spring Boot 2.1.2
* Spring 5.1.4

Minor test fixes related to the upgrade.

issue #3

• JMS client/server w/ ActiveMQ
• Improved API
• Minor tweaks to shell UI

command line ui stabilization

Focus was on improving text based UI. In previous versions, viewing and writing chats was handle by the same single client app. With text based interface this design presented practical problems. For example, while in the middle of writing a chat message, arriving chat would override console input of what was being written. In this release, chat viewing and writing concerns have been separated into different apps. This solves the input/output problem, but also provides for great flexibility. One can now fire just a reader client to view public chats which may be useful for instance when chats are about a sports game, etc.

• separated command cline client into reader/writer
• improved API
• major stabilization and improvements
• unit tests: 96% code coverage

Minor Improvements

• enhancements to API
• stabilized server and command line client

Moo is born

Very basic concepts. Chat server and a single moo client.