IE 8 problems

[vmarzullo]

Hi, i'm trying to test the postal.federation example on Internet Explorer 8....but it fails, and all the messages are not showed. I've seen in debug mode that the publish function in postal.js does not enter at this line when I try to send a message from the page to the iframes:
_.each(this.subscriptions[envelope.channel], function (subscribers) { // line 378

Does the library support this browser version?

[ifandelse]

@vmarzullo originally IE8 support was present, though it's possible it's drifted away from it over time. IE8 is beyond end-of-life (was officially retired in April of 2014, IIRC), and it's been one of the most problematic browsers for the postal.federation/xframe effort....so while I'm open to PRs to help it work in IE8, it's very unlikely that I will be investing a lot of time focused on that specific browser version. I will keep this issue open as a reminder to take a look when i get a moment, in case it's something simple.