Update whatsnew doc from PR files
Merge pull request #5007 from takluyver/pr-whatsnew-3

Update whatsnew doc from PR files
don't write cell.trusted to disk

Notary.check_cells should pop the keys, not just read them.
Add notebook examples link to help menu.
Merge pull request #5015 from minrk/check-cells-pop-trusted

don't write cell.trusted to disk
Merge pull request #5017 from takluyver/help-menus-nbexamples

Add notebook examples link to help menu.
more subtle kernel indicator

add casper.wait_for_busy
like wait_for_idle, but busy

restore kernel notification widget
it's still used for interrupt / restart

use wait_for_busy in check_interrupt test
Merge pull request #4842 from Carreau/fix-JG-complaint

more subtle kernel indicator