Merge branch 'rpcfrontier' into develop

cmd/ethereum/main.go

cmd/mist/assets/examples/coin.html

cmd/mist/assets/ext/ethereum.js/dist/ethereum.js

cmd/utils/flags.go

core/block_processor.go

core/chain_manager.go

core/state_transition.go

javascript/types.go

miner/worker.go

rpc/api.go

rpc/api_test.go

rpc/args.go

rpc/args_test.go

rpc/messages.go

rpc/responses.go

rpc/util.go

rpc/util_test.go

vm/vm.go

xeth/xeth.go