Test case creation structure

[danielbrendel]

Tests need to be created either as Feature or Unit test cases. Therefore the console command to create a test must accept a parameter to specify whether a new test shall be a feature or unit test.

Tests then go either to app/tests/feature or app/tests/unit. This new application structure must be both reflected in the directory and phpunit.xml on the app side of the product.

This allows a better categorization depending on the type of test.