Merge pull request #523 from CoiniumServ/master

sync with master
Fixed handling of default.json pool configuration.
Fixed a bug with loading of pool json files with filenames starting with a,b,c and d.
Moved a few more common values to default-example.json.
Merge pull request #525 from raistlinthewiz/develop

Fixed handling of default.json pool configuration.
Merge pull request #526 from CoiniumServ/develop

Hotfix for v0.2.0 - default.json handling