Add additional commands to ones we know return data type.
Add additional commands to ones we know return data type.

getaccount and getnewaddress

jimmysong/btcd,Roasbeef/btcd,jrick/btcd,tb00/btcd,dajohi/btcd,decred/dcrd,dajohi/btcd,btcsuitereleases/btcd,ppcsuite/ppcd-old,adiabat/btcd,pkothbauer/btcd,Stash-Crypto/btcd,stevenroose/btcd,jcmincke/dcrd,mathiasrw/btcd,ppcsuite/ppcd,CryptocurrencyCabal/htcd,Dirbaio/btcd,dajohi/btcd,jcmincke/dcrd,wallclockbuilder/btcd,adiabat/btcd,soapboxsys/ombfullnode,CryptocurrencyCabal/htcd,btcsuite/btcd,sysbot/btcjson,cjepson/btcd,jongillham/btcd,davecgh/btcd,hectorj/btcd,ltcsuite/ltcd,cqswxj2013/btcd,1d4Nf6/btcd,DanielKrawisz/btcd,runeaune/btcd,BitGo/prova,aakselrod/btcd,BitGo/prova,danoctavian/btcd,jrick/dcrd,toddfries/btcd,jongillham/btcd,ppcsuite/ppcd-old,mathiasrw/btcd,qchain/btcd,davecgh/btcd,ppcsuite/ppcd,btcsuite/btcd,jcmincke/dcrd,danoctavian/btcd,aakselrod/btcd,tb00/btcd,runeaune/btcd,wallclockbuilder/btcd,jrick/dcrd,Roasbeef/btcd,dan-da/btcd,stevenroose/btcd,sysbot/btcjson,soapboxsys/ombfullnode,decred/dcrd,dan-da/btcd,1d4Nf6/btcd,jimmysong/btcd,pkothbauer/btcd,Stash-Crypto/btcd,jrick/btcd,hectorj/btcd,btcsuitereleases/btcd,Cleawing/btcd,Dirbaio/btcd,ltcsuite/ltcd,qchain/btcd,cqswxj2013/btcd,Cleawing/btcd,toddfries/btcd,DanielKrawisz/btcd,jrick/btcd,cjepson/btcd,Dirbaio/btcd,glv2/ppcd,glv2/ppcd