adding a new argument on \Backend\Shared::start for specific FastCGI Params

This PR is in relation with Issue #2

The new parameter are named **$fcgiParams**, with him, we can specify more parameters dedicated to `\Hoa\Fastcgi\Responder`.

It's useful for specify parameters dedicated to *Worker*, can read in *Super Global* **$_SERVER**.

**An Exception will be triggered when variable are different than array.**