Google Maps Onebox data is not cached

[techAPJ (Arpit Jalan)]

@sam

my vote here is that we should just nuke the moneta dependency and dump cache logic built into the onebox gem and have consumers be in charge of it.

Done via

https://github.com/discourse/onebox/commit/8c61a33a6e4459fc267cecb7a2938fa58544bd55