Edge compatibility

[danburzo]

Hi, has anyone tried to tackle Microsoft Edge compatibility? Right now the demo behaves erratically on Edge (testing on 15.15063). I'd like to look into it, but would appreciate any pointers.

[danburzo]

I narrowed it down to this combination of placeMarkers() and selectMarkers() in pushHistory:

scribe/src/scribe.js

Lines 180 to 182 in f60e071

	selection.placeMarkers();
	var content = scribe.getHTML();
	selection.removeMarkers();

Commenting them out fixes the Edge problem, now investigating what's tripping it up.