Use of UTC datetime instead of local datetime

Hi,

The Hessian protocol specifies that a date should be represented as a 64-bit long of milliseconds since Jan 1 1970 00:00H, UTC (ref: http://hessian.caucho.com/doc/hessian-serialization.html##date)

In the current implementation, there is a conversion from that UTC date to a C# DateTime with the specification that the DateTime object is expressed in local time. Moreover, there is an additional offset added to the received date. That offset converts the UTC date to a local date in CET zone (UTC+1).

I think that the Hessian client should not deal with such local time concern but should instead serves the date as UTC date (as the protocol states) and leave the consumer of that date decide what to do with it.

The current pull request removes the arbitrary conversion to CET zone and only deals with UTC date time at serialization and deserialization time.

Regards,
Gilles