extend JsonRPC compliance

[mirceanis]

Going through https://github.com/ethereum/wiki/wiki/JSON-RPC, there are a lot more possible methods that are missing from kethereum. I assume the calls that already exist were added on an "as needed" basis.

More (or all) methods should be easily available through kethereum

Please contradict me if that is not the intention

[ligi]

yes you assume correctly ;-)