increase timer watching for designer frame first reply...

... 5s is too short for big project on slow-ish machines. Since this
timer guards against load failure of designer frame (which should seldom
happen), having a bigger value like 30s should not be a problem for user.
ENYO-4003: Added missing transition from closed to reloading
ENYO-4003: reload designer only when project is switched
Merge pull request #791 from enyojs/ENYO-4003

ENYO-4003: fix open document after designer close