Rewrite in TypeScript as a modern ES6 module

[theodorejb]

• Replaced dynamic CSS keyframe animations with requestAnimationFrame
  • This adds support for Content Security Policy "style-src 'self';" option (resolves #115, resolves #229)
  • Fixes janky animation appearance in Microsoft Edge (resolves #342)
  • Fixes missing line with trail set to 100 in IE (resolves #327)
  • Animation logic is now unified in all browsers
• Library is now distributed as an ES6 module (closes #341, fixes #340)
• Removed useless hwaccel option
• Dropped IE 6-8 support and removed VML fallback since it isn't needed for IE 9+
• Moved internal functions out of Spinner instance
• Removed minified files from bundle
• Removed jQuery plugin (closes #325)
• Dropped bower/composer/component/spm support. Install from npm instead (recommended), or save spin.js file in your repo.
• Updated website to use native range inputs rather than polyfill, and remove jQuery usage
• Added CONTRIBUTING.md file

Version 3.0 does not change the public Spinner API, so if you are already using a module bundler such as Webpack or Rollup, upgrading should be as easy as adding the following ES6 module import:

import {Spinner} from 'spin.js';

[theodorejb]

This should also fix #309.

[theodorejb]

You can test the new version here: https://theodorejb.github.io/spin.js/

[fgnass]

💯 Thank you very much, your help is highly appreciated! I added you as collaborator to this repo. Feel free to modify whatever you feel is necessary.

[theodorejb]

@fgnass Thanks! Can you also add me as a collaborator on npm so I can publish releases? My username is theodorejb.

https://www.npmjs.com/package/spin.js/access

[fgnass]

Done.