Merge pull request #4 from kevmoo/master

tweaks
Added example of two-way binding of a custom element's attribute
add note about upcoming feature, remove build.dart
Merge branch 'master' of github.com:sethladd/dart-polymer-dart-examples
Merge pull request #5 from nelsonsilva/attribute_binding

Added example of two-way binding of a custom element's attribute
add issue to track bug
add checkbox example
start handling radio buttons
show off observable getters, sort of
Added button click with data example
Merge pull request #6 from chrisbu/button_click_data

Added button click with data example
update readme with collaborators. thanks, all\!
another way to handle radio buttons