For ease, I've added Instant to the JSON auto-mars...

# http4k

[dave]

For ease, I've added Instant to the JSON auto-marshalling and the lenses contract, so from the next release if anyone prefers Instants they can use them. I think that the only other place where we use LDT at the moment is in the Cookie expiry code, we can look to changing that as well for consistency at some point.