Feature: support asynchronous template references #10
Description
e.g. dom node with src:
// HTML
<script type="text/tim" class="foo" src="http://example.com"></script>
// JS
tim("foo", data, callback);
{{ message }}
e.g. dom node with src:
// HTML
<script type="text/tim" class="foo" src="http://example.com"></script>
// JS
tim("foo", data, callback);