Update crowbar_converge to use GET instead of POST.
Flip around keys in HABTM relation for node_roles.

I was building the graph backwards.
Use postgres for everything.
Merge pull request #723 from VictorLowther/pull-req-master-a91d010e6f77c4fc84104247bc7752f73dab5b4d

https://github.com/crowbar/barclamp-crowbar/pull/723

Merged by devtool for cloudedge
Merge pull request #724 from cloudedge/pull-req-master-818ff63843f8669dd6672b800daf568c7aff605f

https://github.com/crowbar/barclamp-crowbar/pull/724

Merged by devtool for VictorLowther
fix breaks from postgresql change
bulk edit (read only) and cleanups from pg change
bulk edit screen READ ONLY and node depoloy selector