add initial answers to questions that were asked

[tomeichlersmith]

This resolves #38

[tomeichlersmith]

@tvami I'm not sure if this is enough, it feels too short, but I'm curious about what should be explain more in your opinion.

[tvami]

I'd add that we have analyzers and producers (and I guess conditions), and everything is derived from that.
Maybe generally too some comment on why we have to configure things in python, together with an example, you know to say that we have a C++ code (RunHeaderAnalyzer.cxx) that inherits from an analyzer base class (EventProcessor.cxx with a class type), which then goes into a python class def class RunHeaderAna(Analyzer) :. Ohhh and then the fact that each module is under its own namespace?

[tvami]

Looks good thanks