[btcsuite/btcutil] 2c26dd: bloom: Avoid a few unnecessary hash copies. (#76)

[Dave Collins]

  Branch: refs/heads/master
  Home:   https://github.com/btcsuite/btcutil
  Commit: 2c26dd81a59fd671a2218d63ad138a6dd4d693bd
      
https://github.com/btcsuite/btcutil/commit/2c26dd81a59fd671a2218d63ad138a6dd4d693bd
  Author: Dave Collins <d...@davec.name>
  Date:   2016-04-23 (Sat, 23 Apr 2016)

  Changed paths:
    M bloom/example_test.go
    M bloom/filter.go

  Log Message:
  -----------
  bloom: Avoid a few unnecessary hash copies. (#76)

This changes several places which call the Bytes method of a ShaHash to
simply use a slice of it in order to avoid the extra unnecessary copies.