[conformal/btcjson] 5ced99: Add test for listsinceblock.

[John C. Vernaleo]

  Branch: refs/heads/master
  Home:   https://github.com/conformal/btcjson
  Commit: 5ced990c2234be842068a628ea025b5db9269a4c
      
https://github.com/conformal/btcjson/commit/5ced990c2234be842068a628ea025b5db9269a4c
  Author: John C. Vernaleo <j...@conformal.com>
  Date:   2014-01-06 (Mon, 06 Jan 2014)

  Changed paths:
    M jsoncmd.go
    M jsoncmd_test.go
    M test_coverage.txt

  Log Message:
  -----------
  Add test for listsinceblock.
Fix bug in listsinceblock found by test.