multiparty
Symmetric key encryption
This should resolve the symmetric keys issue.
A symmetric key will be generated right after a public key is received, so that the key can be encrypted using the public key. There's are checks to coordinate which party generates the key (parties with lower id).
There's also a new demo called sum-presentation which should help with logging and simulation of the scenario. Also added logging to the library itself. If you don't like the logging and think it's too cumbersome for the code, we can just roll back one commit. The logging is only in the final commit.
I've always tried to stick to the styles and conventions I see in the code as much as possible, and tried commenting as much as possible too. So finally please review the code and feed me back. I hope you like it =D
