Improve travis tests: test other php versions (5.6, 7 and hhvm); run code style tests only on one php version

[andrepereiradasilva]

Check code difference

I'm not sure is anything else is needed.

the patchtester travis.yml is a little different reggarding CS
See https://github.com/joomla-extensions/patchtester/blob/master/.travis.yml

[andrepereiradasilva]

it seems something more is needed because travis did not run on this PR

[mbabker]

Since you're not actually using the RUN_PHPCS global you don't need to define it. Otherwise, the test scripts are set up here differently than they are in the patchtester repo so not much else I can say on that.

[andrepereiradasilva]

ok thanks @mbabker
It's now testing on php 5.6 and php 7 too

[andrepereiradasilva]

Guess what: it pass the php 7 test :)

[infograf768]

I honestly have no idea if this should be merged or not.
@javigomez , please decide.

[javigomez]

I see we are currently not running the system tests in travis so should not affect. Checking the builds after George's merge seems all to work okay.