Added list of contact lists request

Added list of contact lists request

Add DataMember attributes, use PascalCase for names and replace generic names with more specific ones to avoid confusion - these are recomendations of @nover

Syntax errors corrected

Change DateTime properties to string because deserialization of .NET type DateTime in WCF requires some more work e.g. the use of attributes [IgnoreDataMember], [OnSerializing] and [OnDeserialized] along with a private property - see https://stackoverflow.com/questions/18511147/change-default-date-serialization-in-wcf. String datestamps can be easily translated to DateTime explicitly by the caller as necessary. Adding DataMember attributes revealed the problem of deserialization of the DateTime properties (but not before runtime) - it caused exceptions where as without the DataMember attribute, the deserialization failure was not notified.

…ged each of their names to inclide the postfix "TimeStamp" to imply to the user that unix epoch is the value.