Modular loading

[mjallday]

In #1309 @kyungmin added the d3 library to the dashboard.

d3.js isn't the largest library (53KB) but it did trigger a thought I've been having which is we're adding more and more functionality to the dashboard and it's currently sitting at about 800KB for the initial load.

Is it possible, and are there libraries, that will allow us to incrementally load content onto the page as it is required? I'm thinking something like requirejs could be very well suited to this task.

@cohitre any thoughts/experience with doing this? Does the fact that we're using Ember.js make this any easier or more difficult?

[cohitre]

Ember, jquery, moment, bootstrap-modal, lodash and mixpanel should be loaded through CDNs, no point in compiling those into prod.js. This alone should give us a big difference in file size.