[conformal/btcjson] a5b1a3: Use the net package function for credentials.

[Dave Collins]

  Branch: refs/heads/master
  Home:   https://github.com/conformal/btcjson
  Commit: a5b1a31e073d67be0215e68ce3714b2cfd661bfd
      
https://github.com/conformal/btcjson/commit/a5b1a31e073d67be0215e68ce3714b2cfd661bfd
  Author: Dave Collins <da...@conformal.com>
  Date:   2014-09-20 (Sat, 20 Sep 2014)

  Changed paths:
    M jsonfxns.go

  Log Message:
  -----------
  Use the net package function for credentials.

This change ensures any usernames or passwords which contain symbols that
would confuse the URL parser are properly escaped.