Merge pull request #1 from techdivision/master

mergin upstream
fixed session identifier overwrite when it was set manually before session start was called
Merge pull request #72 from wagnert/master

Bugfix PHPUnit tests
Merge branch 'master' of https://github.com/techdivision/TechDivision_ServletContainer
updated documentation
Merge pull request #73 from wick-ed/master

reviewed diff
reformatting to fit code style
phpcs
phpcs
Merge pull request #75 from wick-ed/master

reformatting to fit code style