Deprecate getlanguagebar

The function getLanguageBar isn't doing anything that a developer can't do themselves directly in a template.  There for removing it in v1.0 will make supporting the package that much easier.  

I've added an example for creating a language selector in the README.

Also, no objections in https://github.com/mcamara/laravel-localization/issues/61

Please merge pull request https://github.com/mcamara/laravel-localization/pull/69 before this one.

Tag v0.13.0