Features that make plugin developer's life easier

[JeroenVinke]

• [x] karma
• [x] travis ci pre setup (task 1, task 2)
• [x] eslint setup
• [x] wallaby
• [x] dts generation and api.json extraction setup
• [x] intrinsic sample app
• [ ] making it easy to create docs (that hook into aurelia's documentation app?)
• [x] config builder pattern here. Allows for very powerfull plugin configuration by plugin user
• [ ] docs on how to publish releases (both github and npm)
• [ ] docs on how to register to aurelia + jspm registry
• [ ] docs on how to setup travis ci
• [ ] docs on creating gitter channel for discussions
• [ ] gh-pages gulp task

[JeroenVinke]