EpochFloatTime

[SJD]

It would be nice to have a more precise EpochTime type. I'm a Ruby newbie, but this seems to work for me;

class EpochFloatTime < Float

        def load(value)
            case value
                when ::Float, ::Integer
                    ::Time.at(value)
                else value
            end
        end

        def dump(value)
            case value
                when ::Float, ::Integer, ::Time then value.to_f
                when ::DateTime then value.to_time.to_f
            end
        end
    end

[tpitale]

Could you send a PR, and we can review that. Thanks @SJD!