Merge pull request #526 from CoiniumServ/develop

Hotfix for v0.2.0 - default.json handling
Update README.md
Merge branch 'master' of https://github.com/CoiniumServ/CoiniumServ into develop
Removed json-rpc nuget package and added it as a gitsubmodule as it did have an outstanding bug which we got fixed and waiting for PR to be merged (https://github.com/Astn/JSON-RPC.NET/issues/28).
StratumService.cs:SubscribeMiner() does now have correctly set all parameters as optional.
Merge pull request #535 from raistlinthewiz/develop

mining.subscribe fix.