Creating an initial 4.0.0 release for xenial with php-fpm.

Release 2.2.0 updates dependency librarires.

Merge pull request #22 from zivtech/aptgetupdatefix

Ading apt-get update provision line. Fixes Issue #11.

Rolling a new fix with better opcache handling and default options.

Improved documentation and file permissions.

Fixing deleted readme that was breaking things.

Rolling a 2.0.0 tag ready for wider use.