Fixes URL localization issue when the base path is not /

This should fix issues https://github.com/mcamara/laravel-localization/issues/31, https://github.com/mcamara/laravel-localization/issues/47, https://github.com/mcamara/laravel-localization/issues/74

And possibly https://github.com/mcamara/laravel-localization/issues/67

Tag as v0.13.1