[btcsuite/btcwallet] 156350: Drop fastsha256 in favor of crypto/sha256 (#468)

[David Hill]

  Branch: refs/heads/master
  Home:   https://github.com/btcsuite/btcwallet
  Commit: 15635025c4968bee177a789937ff54f372c1c3ec
      
https://github.com/btcsuite/btcwallet/commit/15635025c4968bee177a789937ff54f372c1c3ec
  Author: David Hill <dh...@mindcry.org>
  Date:   2017-01-12 (Thu, 12 Jan 2017)

  Changed paths:
    M .travis.yml
    M config.go
    M glide.lock
    M glide.yaml
    M rpc/legacyrpc/server.go
    M snacl/snacl.go
    M votingpool/example_test.go
    M votingpool/input_selection_wb_test.go
    M votingpool/withdrawal.go
    M votingpool/withdrawal_wb_test.go
    M waddrmgr/db.go
    M wtxmgr/query_test.go
    M wtxmgr/tx_test.go

  Log Message:
  -----------
  Drop fastsha256 in favor of crypto/sha256 (#468)