Move files to src and tests directory

[ruudk]

See #323

Moving all the sources to src and tests to tests.

This way, the tests won't be distributed when people use this library.

Tests are failing because of HHVM #326

[alexislefebvre]

Is it a feature from Composer to not share files in the tests directory?

[ruudk]

Yep, see this in composer.json

 "autoload": {
        "psr-4": {
            "Liip\\FunctionalTestBundle\\": "src/"
        }
    },
    "autoload-dev": {
        "psr-4": {
            "Liip\\FunctionalTestBundle\\Tests\\": "tests/"
        }
    },

[ruudk]

It makes sure that when I require this is a normal dependency (non dev) it will only pull src