Added a notice that code completion requires additional package

Preparing 2.3.6 release.

Updated changelog, updated docs, updated tested Laravel project in travis

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