simplified unit testing

[romankonz]

It was a bit complicated to run unit tests.
Also the travis-script is much simpler (hope it works, i'll fix that recently if not).
Now you can run "git clone .... && cd tests && composer install --dev && phpunit" without need for a skeleton application.

[romankonz]

no, first try on travis does not work, i'll fix it now

[romankonz]

Travis build is working now.
if you agree with this change i'll do some more related cleanup before merge (or i can do this in another PR)
After this change, it's much easier to contribute in my opinion because you can work on a standalone clone. But on the downside it has it's own vendor folder. That's why i'm waiting for feedback before i continue.

[Ocramius]

More of this, please :-)

[Ocramius]

@romankonz and thanks! :D