remove install command if download is disabled (#39)

When setting `download_binary` to `false` the following exception is
thrown:
`The service ".sensiolabs_minify.command.minify_install" has a
dependency on a non-existent service
".sensiolabs_minify.minifier.minify_installer". Did you mean this:
"sensiolabs_minify.minifier.minify"?`

So the install command should also be removed if `download_binary` is
`false`.

Signed-off-by: araab <araab@users.noreply.github.com>

Author: araab

src/SensiolabsMinifyBundle.php

@@ -59,6 +59,7 @@ public function loadExtension(array $config, ContainerConfigurator $container, C
         if (!$config['minify']['download_binary']) {
             $container->services()
                 ->remove('.sensiolabs_minify.minifier.minify_installer')
+                ->remove('.sensiolabs_minify.command.minify_install')
             ;
         }