A few features

[piegamesde]

• Exclude annotation to exclude single fields
• Documented the additional arguments of the serialization hooks
• Expose method parameters as well

Let me know what you think of each of these (I just didn't want to make a separate PR for each tiny commit). They are all untested yet, I'll polish them later on if the general idea gets approved.

[julman99]

@piegamesde thanks a lot for your contribution. Something happened with my github settings and I stopped getting notifications for this project altogether, so I apologize for the delay. I like the ideas you submitted and will do some minor changes over the holidays, then merge.

Thanks again!