Fixing condition in popstate event handler

[zipper]

After merging #33, the popstate history stopped working at all. I believe the reason is that e.event is always undefined on this line. e is jQuery Event Object, which does not contain property event. The proposed and linked solution on stack overflow however uses native JS event. Therefore, the correct condition should be using e.originalEvent.state:

...
if (initialPop || !e.originalEvent.state) {
...

[zaxxx]

:+1: Just bumped into same issue and this fix works.