[conformal/btcscript] d5cc72: use btcec structs instead of ecdsa structs

[Jimmy Song]

  Branch: refs/heads/master
  Home:   https://github.com/conformal/btcscript
  Commit: d5cc72dc278d87ec4c348af7f80cba17aa992ffc
      
https://github.com/conformal/btcscript/commit/d5cc72dc278d87ec4c348af7f80cba17aa992ffc
  Author: Jimmy Song <jaej...@gmail.com>
  Date:   2014-10-12 (Sun, 12 Oct 2014)

  Changed paths:
    M opcode.go
    M script.go
    M script_test.go

  Log Message:
  -----------
  use btcec structs instead of ecdsa structs