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project.

Javascript tutti.js and timeline.js is needed, and then the following to
init the timeline:

$('.timeline')
    .timeline({
        url: '/api/timeline'
    });

# Javascript Notes:
## ES6 transpile:
* Files in src/scripts/js/es6/common will be transpiled from
modern es6 js to old es5 js, and then added to tutti.js
* Files in src/scripts/js/es6/individual will be transpiled from
modern es6 js to old es5 js to individual module files
## JS Testing
* Added the Jest test framework to write javascript tests.
* `npm test` will run all the javascript tests

Thanks to Sybren for reviewing

src/scripts/js/es6/common/templates/utils.js

@@ -0,0 +1,24 @@
+function thenLoadImage(imgId, size = 'm') {
+    return $.get('/api/files/' + imgId)
+            .then((resp)=> {
+                var show_variation = null;
+                if (typeof resp.variations != 'undefined') {
+                    for (var variation of resp.variations) {
+                        if (variation.size != size) continue;
+                        show_variation = variation;
+                        break;
+                    }
+                }
+
+                if (show_variation == null) {
+                    throw 'Image not found: ' + imgId + ' size: ' + size;
+                }
+                return show_variation;
+            })
+}
+
+function thenLoadVideoProgress(nodeId) {
+    return $.get('/api/users/video/' + nodeId + '/progress')
+}
+
+export { thenLoadImage, thenLoadVideoProgress };