* Added a PaymentRequest object
* A `PaymentRequest` can be serialized/deserialized with `write`/`read`
static functions in companion
* Amount validation is handled in constructor
* `ReceivePayment` message in payment handler generates a `PaymentRequest`
* Updated tests
* HTLC succeeds if amount is equal or greater than requested amount
* If the amount paid is more than twice the amount expected, the HTLC fails
* (gui) display payment failed cause in notification
* Improved payment request validation messages
* using scodec for failure messages
* we now update routing info and retry payments in case of Update failure
* properly implemented BOLT4/'Receiving Failure Codes' (also fixed a bug with UnknownPaymentHash)
* added integration tests on htlc timeout
* relayer now sends an UpdateFail to downstream when an htlc timeout hits the blockchain
* added integration tests on extracting preimage from blockchain
* cleaning up of htlc bindings in relayer
* router now doesn't send a 2nd request to bitcoind when it is notified of a new channel twice in a short amount of time
* peerclient now asks for witness when retrieving blocks from bitcoind
* getTxBlockHash now returns None instead of an error when tx is in the mempool
* we now look into the mempool when checking for WatchSpent
* fixed FundingSigned been sent twice when deferring an early FundingLocked
* added zeromq listener, removed predefined eclair.conf files in test, limited concurrent rpc calls to 5 for the router
* Update README.md with ZMQ configuration
* Added a warning and link to alpha2 install instructions
* removed PeerClient
* improved PeerWatcher performance
* Added help option in command line; added version in logs
* Version and commit id added in manifest (use Specification-Version for commitId)
* (gui) version in about is now dynamic; ESC key closes about
* Excluded unused protobuf dependency
* Update README.md
