Change versioning scheme

[jsantell]

Right now this version is tracking the webvr-polyfill version 0.9.27, but this seems unsustainable, as the polyfill is now 0.9.28, and in the case where the polyfill is using the dpdb as a dependency, like it could get confusing.

I propose for simplicity, just publishing 1.0.0, and incrementing patch versions with new devices from there, and the polyfill can bump dependencies when needed.

@cvan thoughts?

[cvan]

yeah, that seems fine