Update Tether to v1

Update Drop to v1.1.0

Major updates (UMD, ES6, etc)

• Add UMD support
• Convert Coffeescript to ES6 (via Babel)
• Restructure directory tree
• Update README
• Add CONTRIBUTING file
• Update Gulp build
• Remove bundled version
• Fix package.json and bower.json
• Bump to 1.0.1

First public release

v0.1.0

Create a welcome page