ENYO-3180: fix previousContent determining
Merge branch 'master' of github.com:enyojs/ares-project into ENYO-3101-1
ENYO-3180: simplify previousContents determining by using only the one of the kind selected: previousContent
Merge branch 'master' of github.com:enyojs/ares-project into ENYO-3101-1
ENYO-3101: check that file rendered is the right one as expected by the designer
Merge pull request #576 from enyojs/ENYO-3101-1

ENYO-3101: Check if rendering in progress is the the one expected for the opened file