v1.6.0

Changelog

• Can now remove a toast programmatically. When you display a toast, the function return a toastId. You can use it
  as follow to remove a given toast toast.dismiss(toastId)
• If the container is not mounted, the notification will be added to a queue and dispatched as soon as the container is mounted.
  For more details check issue #4
• Added --no-idents flag to cssnano to avoid animation name collision with others libs.
• Tests are no longer transpiled