New Currency and CurrencyPair

Added Dogecoin Currency/CurrencyPair.
updated rescu version, cleaned up REST annotations
DOGE -> XDC in BTER
DOGE -> XDC in Currencies
DOGE -> XDC in CurrencyPairs
DOGE -> XDC in Vircurex
Added XDC to MoneyDataExtension
Merge pull request #317 from dhenry/develop

New Currency and CurrencyPair
cleanup mygo module
Merge branch 'develop' of github.com:timmolter/XChange into develop
checks for null timestamp in compareto method
Merge remote-tracking branch 'upstream/develop' into develop