Strip the IPY_MODEL_ prefix from widget IDs before referencing them.
"event" is not defined error in Firefox

see http://stackoverflow.com/questions/20522887/referenceerror-event-is-not-defined-error-in-firefox
"WebKit follows IE's old behavior of using a global symbol for "event", but Firefox doesn't..."
Add test for globbing
Use correct path in files writer
Add whatsnew entry for unicode completion
Fix several small bugs in the notebook trust framework

1. The trust dialog is not called with the notebook context, so we have to use the closure to bind to a notebook event.

2. Replace != with !==

3. The trust_changed.Notebook event default handler expects the trust value to be value key inside an object.  In fact, the event handler is redundant with the code--both seem to set the trust value of the current notebook.
Merge pull request #6460 from jasongrout/trust

Fix several small bugs in the notebook trust framework
Merge pull request #6451 from takluyver/unicode-typing-whatsnew

Add whatsnew entry for unicode completion
Update release notes from PR additions
Merge pull request #6461 from takluyver/pr-whatsnew-7

Update release notes from PR additions
Destroy backbone model on comm:close
Check time of last ping before timing out a missing pong.
Merge pull request #6467 from richardeverson/master

Stop websocket timeouts when kernel is suspended
Merge pull request #6446 from jhamrick/fix-files-writer

Fix globbed files in nbconvert FilesWriter
Merge pull request #6377 from jasongrout/fix-widget-prefix

Strip the IPY_MODEL_ prefix from widget IDs before referencing them.
Merge pull request #6437 from weichm/patch-1

"event" is not defined error in Firefox
simplification of trigger destroy
Warnings if there is a bias in timings due to some side-effects of the method
Clear prompt numbers in clearoutput preprocessor
Trim anchor link in heading cells, fixes #6324