gghourglass v0.0.2

• Added annotate_periodstates(), uses_dst() lunar_phase_polygon() and annotate_lunarphase()
• Updated documentation
• Added vignettes
• Improved test coverage
• Some small tweaks

gghourglass v0.0.1

• Initial release which can:
  • Split dates and time of day from datetime objects
  • Add the date and time of day components to a ggplot as layer
  • Add sunlight annotations to the plot