[conformal/btcd] 8e7434: Detect chain reorgs that happen during a rescan.

[Josh Rickmar]

  Branch: refs/heads/master
  Home:   https://github.com/conformal/btcd
  Commit: 8e74343747749e62d9e00d839bb2dde448dafc5f
      
https://github.com/conformal/btcd/commit/8e74343747749e62d9e00d839bb2dde448dafc5f
  Author: Josh Rickmar <jr...@conformal.com>
  Date:   2014-07-25 (Fri, 25 Jul 2014)

  Changed paths:
    M rpcwebsocket.go

  Log Message:
  -----------
  Detect chain reorgs that happen during a rescan.

While here, switch rescan method to use hashes, not heights, to refer
to starting and ending blocks.

Closes #151.

ok @davecgh