2.0.0 Consolidate uid/id/toasterId into single toasterId

Features

• all toaster.pop() and toaster pop helper methods (toaster.success(), toaster.error(), etc) return a toast wrapper object composed of a toasterId and toastId.
• toast.clear() accepts either toasterId and toastId arguments or the toast wrapper object returned from toast.pop().
• If a toastId is not provided when creating a new toast, a GUID is generated and assigned to the toast before emitting to receiving containers.

Breaking Changes

• uid and id removed and consolidated into a single toastId
• prevent duplicates now checks for either last body match OR ID match
  on any toast, since toastId is now always defined
• prevent duplicates no longer removes the toast first if the id is
  matched, it just returns and does not add the duplicate toast
• id is no longer incremented per toast container.