Css classes to the rescue

• Add exit/mutate/enter classes during mutation (configurable via options)
• ⚠️ Rename timeout.mutation option in timeout.mutate
• ⚠️ Rename onMutation option in onMutate
• Update readme
• Update example

Interactive mutate support

• Add interactive mutate support
• Enhanced documentation

Initial release

Only morbido.watch() and morbido.stop() are supported.