Bump rangy version.

I want to use the rangy-textrange plugin for integration tests, but that's a rangy 1.3 thing. Since it's been a long time since there has been a new rangy release, let alone a stable one, I'm going to bump this to the latest "alpha" version.

It looks like the Toolbar.html page wasn't working at all - now it's still buggy, but it's at least referencing files that exist.