Merge branch 'feature/refactor_vm' into develop

README.md

ethchain/asm.go

ethchain/block.go

ethchain/block_chain.go

ethchain/state_manager.go

ethchain/state_object_test.go

ethchain/state_transition.go

ethchain/transaction_pool.go

ethchain/vm_env.go

ethchain/vm_test.go

ethpub/pub.go

ethpub/types.go

ethstate/.ethtest

ethstate/errors.go

ethstate/state.go

ethstate/state_object.go

ethstate/state_test.go

ethutil/value.go

ethvm/.ethtest

ethvm/asm.go