client: introduce QueryContract() and QueryContractCode(); correct Status()
client: introduce QueryContract() and QueryContractCode(); correct Status()

benjaminbollen/burrow,eris-ltd/eris-db,benjaminbollen/eris-db,benjaminbollen/eris-db,silasdavis/burrow,silasdavis/burrow,silasdavis/burrow,eris-ltd/eris-db,benjaminbollen/burrow