Addes notify subscribers to get key refs and get balance objects.  Also logs error on duplicate registrations
Addes notify subscribers to get key refs and get balance objects.  Also logs error on duplicate registrations

poqdavid/graphene-ui,BunkerChainLabsInc/freedomledger-wallet,merivercap/bitshares-2-ui,BitSharesEurope/graphene-ui-testnet,BitSharesEurope/testnet.bitshares.eu,openledger/graphene-ui,valzav/graphene-ui,BunkerChainLabsInc/freedomledger-wallet,bitshares/bitshares-2-ui,BitSharesEurope/wallet.bitshares.eu,cryptonomex/graphene-ui,trendever/bitshares-ui,poqdavid/graphene-ui,bitshares/bitshares-ui,bitshares/bitshares-ui,bitshares/bitshares-ui,poqdavid/graphene-ui,BitSharesEurope/testnet.bitshares.eu,trendever/bitshares-ui,merivercap/bitshares-2-ui,valzav/graphene-ui,merivercap/bitshares-2-ui,valzav/graphene-ui,bitshares/bitshares-2-ui,merivercap/bitshares-2-ui,BitSharesEurope/testnet.bitshares.eu,trendever/bitshares-ui,cryptonomex/graphene-ui,BitSharesEurope/graphene-ui-testnet,BitSharesEurope/wallet.bitshares.eu,trendever/bitshares-ui,cryptonomex/graphene-ui,BunkerChainLabsInc/freedomledger-wallet,openledger/graphene-ui,BitSharesEurope/wallet.bitshares.eu,BitSharesEurope/wallet.bitshares.eu,BitSharesEurope/graphene-ui-testnet,poqdavid/graphene-ui,BitSharesEurope/graphene-ui-testnet,bitshares/bitshares-2-ui,BitSharesEurope/testnet.bitshares.eu,bitshares/bitshares-ui,BunkerChainLabsInc/freedomledger-wallet,valzav/graphene-ui,openledger/graphene-ui