Only interupt keydown() if its a key we recognise.

(Fixes bug where you couldn't command-r to refresh a page)
Fix rendering bug when you type '/' in for bibID

Although it was hilarious, it was not good...
Disable and Enable Save/Don't Save buttons
Merge pull request #247 from nla/hr-funny-bibno-bug

Fix hilarious backslash bug (#245)