Remove scala-js-resource, add Hands-on Scala.js

Scala-js-resource isn't really being maintained anymore, and I've inlined the code directly into the one project using it. 

Also adding the presentation I made at PNWScala, and a link to the e-book I wrote.
Merge pull request #103 from lihaoyi/patch-6

Remove scala-js-resource, add Hands-on Scala.js