Updated p5 library

[shiffman]

I guess there's a larger question of how the p5.js library gets updated. But for now, it would be great to make sure the most recent (0.4.21) is used as there's a key transformation bug that is causing some confusion.

[therewasaguy]

At the moment, here's where we're setting the default files IDs for new projects:
f9caf0f

We can update by creating a new project, pasting the latest version of p5, saving the project, getting the ID of the new p5 file, and replacing it the default ID in pfile.js.

I started looking into automatic updates a while back

p5js-webIDE/app/models/pfile.js

Line 106 in f9caf0f

// File.prototype.setContentsFromLatestP5 = function(fileName) {

That's how we'd get the latest version of the library, but gotta think about the best way to integrate this...

[shiffman]

Ah, thanks I understand better now. I think maybe it makes sense to table this discussion and update manually right now with your temporary solution until we sort out exactly how we will handle file systems (i.e. #100).