add floating graph example

[johnnyhoffman]

Hi, I'm submitting a sketch I made to be on the examples page.

Desc: A quil sketch of a graph with slowly floating nodes, which change color according to breadth-first-search and depth-first-search.

I'm fairly new to Clojure, so I won't be surprised or offended if there are any suggestions to make my code more Clojure-esque.

Also, I noticed a couple things about the instructions here https://github.com/quil/quil/wiki/Adding-new-example-to-quil.info:

• The link regarding "leaf.cljs" is broken.
• "In project.clj file add new entries in :clean-targets" in step 4 is no longer necessary due to this commit https://github.com/quil/quil-site/commit/5bfc42ac7f434612ec28dab909442827e3203df2#diff-0fff143854a4f5c0469a3819b978a483

Best, -Johnny

[nbeloglazov]

Thanks, Johny! I'll try to optimize your code and will open pull request so you can take a look and say if you think the changes are reasonable.

[johnnyhoffman]

Awesome, thanks - I'd love to learn from the changes you make.