Added numbers, json, and uri recipes to book
Added drone.io badge
Updated README.md
Added .buildlog to .gitignore
Reordered dependencies
Web UI templates recipes (first group of several).

Review URL: https://chromiumcodereview.appspot.com//13770011
Removed the book.asciidoc doc because it messes up Atlas
Updated the first five unittest recipes based on reviewer feedback.
Merge branch 'master' into testing

Conflicts:
	recipes/pubspec.lock