Geocoding Service

Issue description
Provide a geocoding service which will provide lat/lngs for an address request.

[DefJunx]

@doom777 i've done a very basic implementation of this, and I also still have to make test cases for it.

Before proceeding though, could you look at the commit and tell me if that's what you had in mind with this issue?

Looks good, just how are you preventing calls to geocode, before googleGeocoderInstance is instantiated?

[DefJunx]

@doom777 I'm not right now, and that's clearly a problem. What would be a good preferred way to implement that?

EDIT: I have implemented a basic guard to check if the instance is defined or not.

Usually the way we solve this is by storing a promise of a member, and not an instance. That way, all calls can be delayed until it's initialized.