ENYO-3792: remove Preview icon button. Project action (Edit/Preview/builds/Debug/Run...) are now available from Harmonia's toolbar withi menu "Project"
Merge branch 'master' into ENYO-3792

Conflicts:
	source/EnyoEditor.js
Merge pull request #777 from enyojs/ENYO-3792

ENYO-3792: remove Preview icon button