Keep sketches on top of other windows, for easier instant feedback.

[tjg]

I believe learners would have a much easier time if sketches were kept on top of other windows.

Positives:

• Doesn't require moving windows around to accomodate sketch, for instant feedback.
• Mac users don't panic wondering why Quil doesn't work. (When the sketch is just hiding under other windows.)

Negatives:

• Code becomes 1 line more complex.
• Big sketches hide the text editor, so you'll often move the sketch to the side or another screen.

Tested on MacOS X.

(lein new quil <my-project> now does this by default: https://github.com/quil/quil-templates/pull/5)

[yokolet]

It's really a nice change! We don't need to find where the window is anymore. :+1:

[rubygeek]

:+1: great!