Fix global, AMD and CommonJS definition

[sarunint]

Fix #470
Fix #479
Supersedes #529

[sarunint]

Hi, @thedustinsmith,

I confirm that this PR works in both global, and in Webpack/TypeScript configuration.

This PR is based on your branch.

[thedustinsmith]

Thanks!

[sarunint]

@thedustinsmith Is this going to be released anytime soon? DefinitelyTyped/DefinitelyTyped#25962 is blocked on this.

[emilyaviva]

@thedustinsmith I am similarly blocked on using Croppie in a project because I can't import it into a modern TypeScript app. Are there any plans to release 2.6.3 containing this change? Failing that, do you know how one can point one's package.json to use the code in master instead of the 2.6.2 release?

[thedustinsmith]

I'm pretty sure you can do npm install Foliotek/Croppie#master or something along those lines. A google search for "npm install git repo branch" should get you pointed in the right direction.

By the way, thanks for taking the initiative to help out and get this one tested. I appreciate it.

[thedustinsmith]

Forgot to mention you in my comment above @emilyaviva