Connect the zkVerifier with the AnonVoting contract on vote method
Removed the zkVerifier4lvls & 10lvls, leaving only the zkVerifier16lvls, which should allow for 65k users in the census, and the proving time is still quite fast, so no need to add complexity with multiple circuits for different census sizes.
Added contract tests with real zkproof being verified in the contract
clientlib:
generate zkproof
castVote method (to send the vote+zkproof to the contract)
resolves #16 , resolves #9
Overview: