5.1.23 version bump

gitignore the right credentials file... (old credentials have been
invalidated!)

5.1.10

Fix widths on submenus following recent Vector change

5.1.9

Restore support for IE 11

5.1.8: Add server.js; bump Node dependencies

Change all usage of $.extend to Object.assign

5.1.7

5.1.7

5.1.6

5.1.6

5.1.5

5.1.5

5.1.4

5.1.4

5.1.1

5.1.1

5.1.0: Place native 'Move' link under 'Page' rather than simulating it

This is to preserve listeners added by other scripts.

Shorten titles for action links ('Delete' instead of 'Delete page').