Edit functionality in the schedule grid is not working

[codersquid]

For SciPy maybe in scipy-conference/symposion@208a644 we picked up an edit view from PyOhio to provide a page where cells in the table view could be edited, but that functionality isn't working here. It's a lot better to use than the django admin, so it would be great to fix this.

http://seattle.pydata.org/schedule/general-sessions/edit/
http://seattle.pydata.org/schedule/tutorials/edit/

[codersquid]

fyi I noticed we need the same kluge here as in the _grid.html and I added that in #70.