6/5 master -> stable - #172

…specified.

…d correctly when event travels through different shadowRoots.

Add test for event path.

…nly behind canary's webkit experimental features flag.

… is now:

1. create instance of template content
2. bind it
3. append to shadowRoot

Previously it was 1, 3, 2 which could lead to attribute values having values with {{}} in them while being in dom. This can create issues like images loading with incorrect urls.

… were not actually included in the runner).

…ty bindings

 - implement unbindAll for polymer elements
 - add test to verify binding propagation under Object.observe

…est from runner while it's expected to fail.

 - binding is now handled by template.createInstance