Added Wallet.parseTransaction(rawTransaction) which will parse a Buffer or hex string representing a transaction (and recover the from address, if possible) and return a new object with the following key:
- nonce (BN)
- gasPrice (BN)
- gasLimit (BN)
- to (checksum address string)
- value (BN)
- data (Buffer)
- v (Number)
- r (Buffer)
- s (Buffer)
- from (checksum address string)