DO NOT MERGE: Docpad Updates

- [ ] Update docpad and plugins to latest versions
- [ ] Remove external compass watcher and use [docpad-plugin-sass](https://github.com/docpad/docpad-plugin-sass) instead
- [ ] Remove *docpad-plugin-livereload* dependency and use [docpad-plugin-tinylivereload](https://github.com/andruhon/docpad-plugin-tinylivereload) instead
- [ ] Update README