Removed 'mariadb_version' variable that doesn't exist anymore
Merge pull request #301 from Ilyes512/fix-mariadb

Removed 'mariadb_version' variable that doesn't exist anymore
forcing yes on apache install, adding apt-key updates for php/apache
updated FPM to only listen to localhost (127.0.0.1) clients - in this case, nginx
Added NGXCB and make use of it within nginx.sh

NGXCB (Nginx Create Block) makes it easy to quickly create and optionally enable it right away. Type in `sudo ngxcb -h` for more info.
Added ngxcb to helpers

- Added ngxcb to helpers
- Removed nghost
- Renamed the helpers including adding '.sh' extension
Some cleaning up for ngxen, ngxdis and ngxcb