Update rocksdb
Update and sort ErrorCode descriptions
Fix some fee logic: (RIPD-614)
* fee_default sets cost in drops of reference transaction
* Offline signing uses fee_default
* Signing multiplier maximum works correctly
* Fix bugs in load fee track
* Remove dead code, add comments
Fix most compilation warnings for gcc, clang, release, debug.
Optimize account_lines and account_offers (RIPD-587)

Conflicts:
	src/ripple/app/ledger/Ledger.h
Create orderbook integration test (RIPD-483)
Remove HashMaps
Cleanups and surface reduction:
* Don't use friendship unless needed
* Trim down interfaces
* Make classes feel more like std containers
Remove unused transaction code.
Handle BIGNUM conversion failure