relationship and key purging

Hello @sjkaliski, 

Please review the following commits I made in branch 'sjkaliski-delete-graph-link'.

c9001329689e1fc9fe86a63d81c74d0c0fc66183 (2014-03-01 16:51:23 -0500)
relationship and key purging

- [ ] The Server JS has been reviewed

R=@sjkaliski