Make Nginx virtual host configuration framework specific

[bravo-kernel]

The current "one generic Nginx virtual host for all frameworks" implementation needs to be refactored to prepare for (easy) extending the number of supported (PHP) frameworks.

Per framework:

• optimized nginx template for php-fpm (default)
• optimized nginx template for hhvm

For general use:

• generic nginx template for php-fpm (default) using index.php, index.htm, index.html, etc
• generic nginx template for hhvm

Additionally:

• add new option to the cakebox site add command to specify framework
• add new option to the cakebox site add command to specify php/hhvm

[ceeram]

in fact site command creates a vhost configuration, not a site. Perhaps rename?

[bravo-kernel]

Totally agree. Feel free to provide the required changes, impacts cakebox project as well.