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
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
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
Include "worst timings" from the tuning to find number of runs
FIX: Zero Division Error
stop listening
Better and more explicit warning message
Merge pull request #6438 from SylvainCorlay/model_destroy_message

Destroy backbone model on comm:close
Merge pull request #6483 from jhamrick/fix-heading-anchors

Trim anchor link in heading cells, fixes #6324
Set prompt number to None
Use cell.prompt_number rather than cell['prompt_number']