* implement a basic tx db that stores how to spend revoked transactions
it's a simple db that stores spending tx indexed by their parent id
* bumped akka version to 2.4.8
* fixed wrong data type in CLEARING and NEGOTIATING handlers
* added a few common handlers
* moved sendAdd/receiveAdd logic to Commitments.scala
* moved htlc index to Commitments class
* cleaned up sig handlers
* removed unused variable
* storing their commit's txid so that we can identify spending tx
* added a log to unimplemented function 'handleTheirSpentCurrent'
* changed ascii art helpers->handlers
* fix misleading comments and code in Channel
* removed unused imports
* added test showing bug when two htlcs share the same r
* added a failing test showing that punish tx output isn't p2wpkh
* fix failing test
* use P2WPKH instead of P2PKH in our "punishment" tx
* fix failing test
* added helper methods in test
* fixed test
We use bitcoind 91abb77970f47b1f6166e564bc695ed30c75bb63
and lightningd 7727797bee8454d4bfaa310c578b94081187f59d from
https://github.com/sstone/lightning branch estimatefee.
Our interop test will now launch lightningd and bitcoind (in regtest mode).
This works on linux only.
* upgrade code to match latest lightningd
use secp256k1 format for sigs, update .proto, use timeouts in blocks insteads of seconds...
* update interrop test
* update comments and fix a few typos
* added nonreg tests on lightning types
* use our extensions for protobuf messages
* add comment to explain why we need getBlockCount
