Transaction/RawTx: renames TxBuilder to Transaction
RawTransaction: re-order functions to project standard
RawTransaction: rename tmpTx to tx
add ECPair module
remove ECKey, ECPubKey, replace with ECPair
doc: no section headers
tests: avoid extraneous anonymous function
travis: ignore Node 0.11 until sinon fixes implemented
ECSignature: enforce valid hashType in toScriptSignature