TMUP-373: Add realpath_root instead of document_root as a flag.

ZendOpcache has problems caching entries based on the symlink.
This stops PHP receiving the symlink and caching php files that change
between deployments.
Minor patch to allow disabling default location block
Merge pull request #23 from inviqa/feature/disable_default_location_block

Minor patch to allow disabling default location block
Merge pull request #20 from inviqa/feature/TMUP-373-zendopcache-fix

TMUP-373: Add realpath_root instead of document_root as a flag.
Add inheritance to site configuration

This is to be able to share config across multiple
sites, even on the same environment.
Add missing recipe include for the util library class