build: setup snapshot builds for experimental and new packages

[devversion]

• Sets up snapshot builds for the experimental packages
• Sets up snapshot builds for the new packages (google-maps, youtube-player)
• Updates snapshot builds repositories to match package name. Similar to how it is done in
  framework, and to improve consistency. This means that:
  • material2-builds becomes material-builds
  • material2-moment-adapter becomes material-moment-adapter.

We can do the rename because Github creates repository redirects. This should prevent breakages for people relying on the builds repositories. Though we never denoted those as public.

@jelbourn @josephperrott If we go with renaming these old build repositories for consistency, then the following things would need to be made:

1. Delete the newly created material-moment-adapter-builds repo.
2. Rename material2-moment-adapter-builds repo to material-moment-adapter-builds
3. Rename material2-builds to material-builds.

[josephperrott]

I am good with your proposal, but we should have @jelbourn sign off as well.

[jelbourn]

LGTM, you can add "merge ready" once Joey can make the repo changes

[josephperrott]

Updating github repos now, and then I will merge this PR.

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