Fix handling of shepherd arguments to lazy nodes.

Hello @majelbstoat, @eford1, 

Please review the following commits I made in branch 'nick-lazy2'.

772a201ecb85d0b6810e924f8add7dc42376ae29 (2013-09-06 19:35:36 -0400)
Fix handling of shepherd arguments to lazy nodes.


R=@majelbstoat
R=@eford1