Pass CanBeNull to string serializer and converter #47
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This resolves #25.
The IStringConverter and IStringSerializer was modified to receive DeserializeOptions as last parameter of Deserialize method. That contains CanBeNull. Serialize assumes null shall be serialized as null, no options need to be passed. If there is an object that may not be null and it will be serialized, it should not be null in the first place, that's the reason serialize options are not needed.
When CanBeNull is true, the behavior is the same. When it's null, "null strings" ("-1", "-") are treated like their actual value instead of null.