Merge branch 'release/0.3.0'

LICENSE

ethchain/address.go

ethchain/address_test.go

ethchain/block.go

ethchain/block_chain.go

ethchain/block_manager.go

ethchain/block_manager_test.go

ethchain/contract.go

ethchain/fees.go

ethchain/genesis.go

ethchain/stack.go

ethchain/state.go

ethchain/transaction.go

ethchain/transaction_pool.go

ethchain/transaction_test.go

ethchain/vm.go

ethchain/vm_test.go

ethdb/database.go

ethdb/memory_database.go

ethereum.go