modified tests, improved configuration, introduced aspect mock and specify.
reverted short array syntax in requirements.php

fixes #1717
move showScriptName into the common config of tests
tests improved, aspect mock changes reverted
aspect mock requirement removed
CS fix
Merge pull request #1714 from Ragazzo/tests_improved

modified tests, improved configuration, introduced aspect
Fixes #1647: Changed the default CSS class of error block to be `error-block`
increase composer timeout setting for apps.
added info about setting testing environment
docs fix
changed composer to require-dev codeception
Merge remote-tracking branch 'remotes/upstream/master'
remove codeception from composer as a requirement