share projects

[shiffman]

Another "next step" feature is sharing. Off the top of my head I think we need share links for:

1. iframe embed
2. share sketch with code editor
3. share sketch without code editor (just the sketch running in the window itself).

Am I missing anything?

[catarak]

I've added a link to the fullscreen view, though I haven't added a "Share" dropdown with a link to the fullscreen view and the embed view.