merge upstream

.gitignore

.travis.yml

ethchain/block.go

ethchain/block_chain.go

ethchain/dagger.go

ethchain/state.go

ethchain/state_manager.go

ethchain/state_object.go

ethchain/state_test.go

ethchain/state_transition.go

ethchain/vm.go

ethchain/vm_test.go

ethereal/Makefile

ethereal/assets/debugger/debugger.qml

ethereal/assets/ext/big.js

ethereal/assets/ext/ethereum.js

ethereal/assets/ext/pre.js

ethereal/assets/ext/string.js

ethereal/assets/facet.png

ethereal/assets/heart.png