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.
Add HHVM support for Nginx
Some minor cleanup in ngxen and ngxdis
Removed hhvm/install_fastcgi.sh execution from nginx.sh
Merge branch 'master' into develop
Merge branch 'master' into develop
Merge pull request #318 from Ilyes512/nginx-create-block

Nginx create block
slight cleanup
apache takes care of hhvm or php proxypass
DRYing up github urls in the vagrantfile
restarting hhvm after installation
disabling default apache vhost no matter what is installed
Add all helper files and use the github_url variable
Merge pull request #319 from Ilyes512/drying-it-up

Using github_url with all helper files
Minor fixes

- Added "github_url" to RVM instead of NVM
- "requred" --> "required"
Merge pull request #320 from Ilyes512/fixes

Minor fixes
Enable HHVM support for composer.sh and laravel.sh
Merge pull request #321 from Ilyes512/hhvm-composer-laravel

Enable HHVM for composer and the Laravel installation
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