Added php5-memcache to php5 setup

Also took the liberty of storing PHP sessions using memcache as well
Merge pull request #35 from FightTheCurrent/master

Added php5-memcache to php5 setup
enable and optimize opcache caching
Merge pull request #44 from FightTheCurrent/feature/opcache

Feature/opcache
Disable Opcache for dev environment
Merge pull request #48 from FightTheCurrent/feature/dev-disable-opcache

Disable Opcache for dev environment
Add fastcgi_param SCRIPT_FILENAME

This could be missing depending on Nginx package versions in Ubuntu so
we're adding it to ensure it's always there.
Always install memcached
Fix plugin name and parentheses.
Merge pull request #51 from c2itllc/readmeupdates

Fix plugin name and parentheses in README.
Tagged playbook roles
Merge pull request #60 from FightTheCurrent/feature/tag-roles

Tagged playbook roles
Improved Vagrant/VirtualBox performance by enabling NFS and increasing host cpu/memory allocation
Merge pull request #63 from FightTheCurrent/feature/improve-vagrant-performance

Improved Vagrant/VirtualBox performance by enabling NFS and increasing h...
Fix #65 - Replace dots in cron file names

Debian and Ubuntu will ignore cron files with dots in the filenames.

See http://manpages.ubuntu.com/manpages/trusty/en/man8/cron.8.html
Hardcode Vagrant VM memory to 1GB
Merge pull request #66 from roots/vagrantfile-settings-update

Hardcode Vagrant VM memory to 1GB