Added optional params support.
The library will itself now track the optional parameters and if rpc-call doesn't supply a value for an optional value for the parameter, it'll be automatically setting a default value for it.
Tiny fix for handler.cs:Handle() where we need to increase the paramCount by one each time we add default-value for an optional parameter that rpc-call didn't set a value for.
added descriptional comment for last change.
Merge pull request #1 from raistlinthewiz/master

Added optional params support. -RastlinTheWiz