v2.0.0

This is a breaking release! Please have a look at the new API interface.
Also feel free to open an issue if you have trouble while migrating!

• Changed interface:
  • Added void pause()
  • Added void resume()
  • Removed constructor Timeout(unsigned long duration)
  • Removed void prepare(unsigned long duration)
  • Removed void start() without arguments
  • Removed bool periodic() without arguments
• Improved tests
• Fixed rollover issues