v0.2.1

• vignette making-maps renamed basic-maps and tidied
• vignette making-maps-with-data renamed data-maps and tidied
• plot_osm_basemap renamed osm_basemap, and now uses
  ggplot2::coord_equal() to ensure maps are scaled to bounding boxes.
• print_osm_map added to enable device proportions to be automatically scaled
  to bounding boxes.
• manual entries cleaned up to remove non-exported functions