core, eth, miner, xeth: receipt storage fix

* Added GetReceiptsFromBlock, GetReceipt, PutReceipts
* Added ContractAddress to receipt. See #1042

Update Ethereum JSON test files, skip failing tests

Upgrade web3 to version 0.7.1

Several bugfixes to IPC channel

miner: ignore future errors

core, miner: miner header validation, transaction & receipt writing

Prevent false from printing on console

* Miners do now verify their own header, not their state.
* Changed old putTx and putReceipts to be exported
* Moved writing of transactions and receipts out of the block processer
  in to the chain manager. Closes #1386
* Miner post ChainHeadEvent & ChainEvent. Closes #1388

eth/downloader: fix a rare test race on the OSX CI

core, xeth: core.AddressFromMessage removed => crypto.CreateAddress

Implement eth/61

core, cmd/geth: improved recover functionality

`geth recover` now accepts both hashes and numbers using "#" and no
longer requires the ethereum instance.

core, cmd/geth: recover by number

Use uint64 for block header timestamp