Demos from twitterdev, additional examples and hacking starting points

Add initial demo code

Added how-many-hashtags.html, race.html

Added match the tweet, and a mistake that fills up the page with profile images

Added REST API folder with some examples

Added README.md for REST API

Bunch of cleanup

Removing all node_modules
Merge pull request #1 from kevinrobinson/kevin-demos

Demos from twitterdev, additional examples and hacking starting points