more description for requirement.
removed cbednarski/fileutils from require-dev as it is not needed anymore with cbednarski/pharrcc v0.2.3
Merge pull request #151 from rejinka/dependency-fix

removed cbednarski/fileutils from require-dev as it is not needed anymor...
allow variants inheritance
move the variant inheritance option from the variants list to an option to the install command and rename it to like