Channel presenter is hard coded towards mobile templates

[antonivanopoulos]

def template_path
  notification.class.views[:mobile_sdk][:template_path].call(notification)
end

We just need to let the channel presenter be told what set of templates to use to render things.

Problem I think a the moment here is that not all the views are set up to be specified like this, so we might need something different there too...not sure if the base notification class is still the best place for that information, could probably just live in the presenter class as well.

https://github.com/Papercloud/notify_user/blob/1.0.0-rc/app/models/notify_user/base_notification.rb#L39