[btcsuite/btcwallet] 948609: Add licenses to files in package zero.

[Josh Rickmar]

  Branch: refs/heads/master
  Home:   https://github.com/btcsuite/btcwallet
  Commit: 948609f06489e5b03a24e9f327ade0e8aebcb308
      
https://github.com/btcsuite/btcwallet/commit/948609f06489e5b03a24e9f327ade0e8aebcb308
  Author: Josh Rickmar <jr...@conformal.com>
  Date:   2015-04-14 (Tue, 14 Apr 2015)

  Changed paths:
    M internal/zero/benchmark_test.go
    M internal/zero/zero.go
    M internal/zero/zero_test.go

  Log Message:
  -----------
  Add licenses to files in package zero.