Makes laravel --no-ansi be respected, even when showing the result of the composer command.

This allows us to get the coloured output from Process.

Before this fix, creating a new application throws a fatal error if the Zip extension is not installed.

Moving this command first to keep 'php artisan optimize' from generating a
'compiled.php' since the .env has APP_DEBUG set to true.

If you run the installer to create a new project it says the
Application key was set successfully even though it wasn't.

This calls the composer script to copy .env.example to .env, so the
next script that calls artisan key:generate will work.

The reason for the current behavior is that php artisan key:generate
doesn't display an error if it fails to find a .env file.

When installing via Composer, it automatically duplicates the .env.example file. Now the Laravel installer will do too.

This addition has been tested.

Previously the OutputInterface was not being passed to this method which
resulted in it throwing an "Undefined variable" exception.