IE crashes when we load SVG assets


Got this error in Internet explorer 11 (running on laptop with i5 processor, 4gb ram) . I was loading **only** svg assets from https://www.dropbox.com/sh/9s1xvbsnukx6u70/AAC3lAt_9xkiTfcPkwGM8Jfba?dl=0 .

``` javascript
viewer = Crocodoc.createViewer(element, {
url: magazinePath,
layout: Crocodoc.LAYOUT_VERTICAL_SINGLE_COLUMN,
enableTextSelection: true,
enableDragging: false,
useWindowAsViewport: true
});
viewer.load();
scope.currentPage = 1;

viewer.on('ready', function (event) {
scope.$parent.viewerNumPages = event.data.numPages;
});

viewer.on('pagefocus', function(page) {
scope.$apply(function() {
scope.$parent.viewerCurrentPage = page.data.page;
});
});
```

Reproduce the crash in Internet Explorer 11 with the SVG assets from the linked Dropbox folder and the supplied Crocodoc.createViewer configuration. Start at the createViewer and viewer.load entry points, then trace the error shown in the attached screenshot. Done means the SVG-only document loads without crashing in IE11 and the behavior is covered by an appropriate regression check.

Written by the indexing model from the issue text.