Update Travis build for auto deployment

[YohanAvishke]

Purpose

The purpose of this PR is to fix #4

Goals

Make Travis auto-deploy any merged change to Master branch

Approach

1. Add necessary env variables to Travis environment.
2. Add Shell script to deploy war files to test server.
3. Update the travis.yml file to execute deploy script after a build.

Checklist

• This PR doesn't commit any keys, passwords, tokens, usernames, or other secrets.
• I have read and understood the development best practices guidelines ( http://bit.ly/sef-best-practices )
• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented on my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation

Test environment

Build environment: Apache Maven 3.6.3
Deploy environment: Ubuntu 18.04.3 LTS, MySQL Ver 8.0.18

Learning

CI/CD, Travis, envsubst

[jayasanka-sack]

Thanks @YohanAvishke !