Update UrlGenerator.php

A simple way to let serve assets from separate sub domain, in the asset url genration helper functions. The sub domain may be set by a configuration value in app.php
Update UrlGenerator.php

Whoops...Sorry... I think this should be okay...  Now let me  Inject the config into the constructor from the service provider..
Update RoutingServiceProvider.php

Injecting asset_host config
Update UrlGenerator.php
Update UrlGenerator.php

Added camelcase for variables
Merge branch 'patch-1' of https://github.com/amalfra/framework
Removed Whitespaces and fixed casing