Build and check the examples using Travis CI

[claudioandre-br]

If you accept this patch and add continuous integration (CI) to your repo:

• It will NOT spoil or compromise your examples;
• Two innocuous files are being added;
• Tests are going to be executed for 1.6x, 1.7x, 1.8x and master (devel).
• It will help us if/when we translate the examples (variables names and comments). BTW: it might help you too.

Since it doesn't hurt, let me take the liberty of suggesting.

Thank you

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PS: and you get, for free, a fancy build passing icon.

[claudioandre-br]

You will have to create an account on Travis in order to enable it. But, it is very easy, no more than 3 mouse clicks needed, and you'll use your GitHub credentials.

If you want to see how it will be:

• https://travis-ci.org/claudioandre/gopl.io

[raypereda]

This looks like a no brainer. There's no downside. I recommend connecting with Travis CI too.