Modularizing the different vote types

[Daniel Gruno]

I thought I'd write a note on what I am currently working on in pysteve, 
which is turning each vote type into a module/plugin.
This is not a complete API yet, but if you look at the libs/plugins dir, 
you should get the gist of what I'm trying to do; making validation and 
tallying a function native to the plugins instead of trying to pull 
everything into election.py. This way we can add new vote types as we 
see fit, and people can enable/disable what they want to use.

There is still some work left, as different vote types have different 
data fields associated with them, and I expect to be able to address 
that in the coming days. This will likely mean breaking the previously 
established JSON structure a bit.

I've also added the D'Hondt (Jefferson) based voting system to the list 
of supported votes types, and I plan to add more vote types as the days 
go by.

WIth regards,
Daniel.