upgrade to polymer 0.10.0-pre.9

Here is the change to upgrade to -pre.9

* add ;component=1 parameter
* add an option for `./grind dartium` to generate build/dartium-out
* add `@initMethod`
* use 0.13.0 of barback

if there's a better way to do the grind stuff, let me know. I just made something up :)

this is targeting Dart SDK 1.4.0-dev