fixed bug 1661, the tool now switches to pan/zoom when a new presentation is loaded
Merge remote branch 'upstream/master' into fix-switch-racecondition
the whiteboard toolbar is now disabled as soon as the client is notified of a new presentation. it better work for real this time
Merge pull request #276 from SenecaCDOT-BigBlueButton/fix-switch-racecondition

fixed bug 1661, the tool now switches to pan/zoom when a new presentation is loaded