HG-110 Custom smart banner

https://wikia-inc.atlassian.net/browse/HG-110
https://wikia-inc.atlassian.net/browse/HG-215

Related to https://github.com/Wikia/app/pull/5385
It should be implicitly set, when the type cannot be deduced. Like in `var standalone;`. In this case `Em.get()` is defined as returning `any`.