* Changed unsaved changes asterisk to an svg circle. #158
* Fixed#100
Unmatched routes are handled by react-router on the client side
and a single wildcard route on server.routes.js renders the index
html.
When the /:username/sketches route is matched and the username is not
valid, the user will be redirected to the index route and a toast
will explain what happened. When the username is 'p5' (default when
logged out) it will show all sketches. Maybe this should be changed
to just public or 'local' sketches?
* Moved unsaved changes SVG to a separate file.
* User not found is now a 404 error.
* Added server rendered 404 page.
* Removed console.log
* 404 Page now renders a random p5 sketch. TODO: make 404 sketches.
* Added 404 header
404 page now fetches a random example sketch
* Moved circle closer to file name
* Render 404 page in SketchList route if !user
