Unit test and Travis CI build integration

[peter279k]

As title, I think we need to do the following items:

• Add the unit tests with PHPUnit to let this PHP package be reliable.
• Integrate the Travis CI build to let the unit test work will be executed automatically.

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[Jord-JD]

Agreed.

I'm not sure the best way to approach this. To create a full integration test, I believe the test framework would need to create a local web server hosting a page with a sample article.