[btcsuite/btcec] 45d21a: Update btcec import paths to new location.

[Dave Collins]

  Branch: refs/heads/master
  Home:   https://github.com/btcsuite/btcec
  Commit: 45d21a254c16dcfac0ff1e5b794955be20c9c408
      
https://github.com/btcsuite/btcec/commit/45d21a254c16dcfac0ff1e5b794955be20c9c408
  Author: Dave Collins <da...@conformal.com>
  Date:   2015-01-16 (Fri, 16 Jan 2015)

  Changed paths:
    M README.md
    M bench_test.go
    M btcec_test.go
    M example_test.go
    M field_test.go
    M privkey_test.go
    M pubkey_test.go
    M signature_test.go

  Log Message:
  -----------
  Update btcec import paths to new location.