Increase font sizes
Better PromiseCompleter API
Faster, smother, more reliable loading

Resolve issues that forced blind setTimeouts, and eliminate the timeouts:

- Listen to custom events from PD inside proxy and use them to time actions;
- Inject the initial design code right in the load(), during the PD loading procedure using the APIs it has internally - faster load with less jitter;
- Avoid PD UI overflowing the container + nudge it into resizing upon loading to work around an apparent bug in Chrome (webview?) - that was fixed by a setTimeout before;
PD: UI polish + splash screen + loading animations = smoth UX
Merge pull request #3549 from ussuri/cde-polymer-designer

Polymer Designer: faster, smoother, more reliable & predictable design loading