Demo page should import to global/window scope

[mdentremont]

Some libraries such as moment, lodash, etc, expose their goodies to the window, such that when on their webpage, I can drop to a JS console and test stuff out myself (ex: I can use _ when on the lodash website).

I would be very useful if we could do the same for this library, I've pushed up a pull-request with the appropriate changes.

[mdentremont]

@thefliik I actually think both would be great -- I tried the sandbox link, and found myself still wanting to drop to the browser debugger just to try some things out quickly (might just be old habits, I tried it out again just now and didn't drop to the debugger yet)

[jorroll]

Fair enough 👍