Bug 963667 - Fix warnings.
Bug 963667 - Pre: Clean some dead code.
Bug 963667 - Pre: Don't send preVerified to production endpoints.
Bug 963667 - Part 1: Include version fragment in FxAccountClient serverURI.

We should learn a lesson from the cluster URL and not bake versions into
the client when it's possible to have the version as configuration
information.
Bug 963667 - Part 2: Rename DEFAULT_IDP_ENDPOINT to DEFAULT_AUTH_SERVER_ENDPOINT.
Bug 963667 - Part 3: Remove duplicate token server endpoints from FxAccountConstants.
Bug 963667 - Part 4: Point at production endpoints.
Bug 963667 - Post: Request certificates good for 12 hours.
Bug 963667 - Use production Firefox Accounts endpoints in Fennec. r=rnewman