Cleanup for help modal and AJAXen.

I made some fixes around the eTags being automatically saved, so that on a POST the ETag is ready for a later PUT without refreshing again.  Also the help modal is fixed up a bit so it shows a success flash on save, because sometimes you try to click Save and the button jumps out from under your mouse, and then you don't save.  Fooey.Also, I fixed up the model name extraction for page-level help slugs, so this part works better now as well.