Merge pull request #10 from zelgerj/master

added COMPOSER_ROOT_VERSION to composer env
removed unecessary travis configurations
Merge pull request #11 from wick-ed/master

removed unecessary travis configurations
removed non standard server vars
changed URI workflow
Merge pull request #12 from wick-ed/master

removed non standard server vars
bugfix: wrong handling of REDIRECT_URL
changed minimum-stability
Merge pull request #13 from wick-ed/master

reviewed diff and tested locally with 0.6.0beta1