add necessary MirrorsUsed to the tutorial files
Merge pull request #61 from sethladd/add-mirrors-used

Add mirrors used
remove the top level pubspec. each subdir has its own pubspec
shadow_dom is now a dependency
add shadow_dom to the list of boilerplate for any angulardart app
Merge pull request #62 from sethladd/add-shadow-dom

Add shadow dom
shadow_dom is already a dependency of angulardart