updated composer, fixed paths

Added phpunit to require dev.

I had errors trying to run the tests which pointed to some path which did not match up.
I have edited these as well.

Atm the tests still fail for me, but atleast it is not because it can not find the files :)

PHP Fatal error:  Cannot redeclare FastRoute\simpleDispatcher() (previously declared in /home/qq/Programming/PHP/arya-test/Arya/vendor/nikic/fast-route/src/functions.php:11) in /home/qq/Programming/PHP/arya-test/Arya/vendor/nikic/fast-route/src/functions.php on line 24