Notifications can be dismissed with ESC

issue #1558

- this is a partial / short term fix for the problem with extra long notifications, so that there is at least one way to remove them.
Merge pull request #1894 from ErisDS/issue-1558

Notifications can be dismissed with ESC
Bump version for pre-release 2
Updating to latest Casper
Removing changelog from release

- this isn't required on account of GitHub & it being ENORMOUS