Refactoring/adjustments

Various minor fixes/ reversions:

- no composer.lock
- adjusted travis.yml
- fixed utf8 issue in class comments
- re-enabled testsuite (using new binary)
- made standard name obligatory for binary selecting (using directory name by default)
- adjusted readme to suggest latest PHP only
- reverted phpcs version range

Sorry, wrong encoding in the project settings of PhpStorm. I changed it.