updated changelog, version dump, docs updated

updated changelog, version bump

Merge branch '2.3' of github.com:Codeception/Codeception into 2.3

updated docs, added phpuni5-loggers to phar and to composer.json,

updated version

Merge branch '2.2'

# Conflicts:
#	src/Codeception/Module/Db.php

Merge branch '2.2' of github.com:Codeception/Codeception into 2.2

updated changelog, version bump, docs generated

Run suite by its path: codecept run tests/unit (Codeception#4079)

version bump, changelog updated