patchwork 1.2.0

• Axes and axis titles can now be collected using the plot_layout() function.
  Collecting axes will remove duplicated axes in the x- or y-direction.
  Collecting axis titles will also remove duplicated titles in the x- or
  y-direction, but also merge duplicated titles in the other direction (#150).
• Fix a bug that prevented faceted plots with axes on the right from being
  used (#340)
• Added free() function to mark a plot to not be aligned with the rest. The
  margin of the plot will still be aligned with the margins of the other plots
  but everything inside of that will by unaligned.