nflplotR 1.0.0

• Added the geom_nfl_logos() geom.
• Added the geom_mean_lines() and geom_median_lines() geoms. (v0.0.0.9002)
• geom_nfl_logos() now tries to clean the team abbreviations by calling nflreadr::clean_team_abbrs()
• Added the color and fill scales scale_color_nfl() and scale_fill_nfl(). (v0.0.0.9003)
• Added the axis scales scale_x_nfl() and scale_y_nfl() in combination with the theme update functions theme_x_nfl() and theme_y_nfl(). (v0.0.0.9004)
• Fixed an incompatible position argument in scale_y_nfl(). (v.0.0.9005)
• Added the function ggpreview() which allows to preview a ggplot in it's actual dimensions. (v.0.0.9006)
• geom_nfl_logos() now supports a colour aesthetic that colorizes the logos. (v0.0.9007)
• Added the function nfl_team_tiers() that build an NFL team tiers ggplot, thanks to Timo Riske for the suggestion. (v.0.0.9008)
• Fixed a bug (#10) in geom_median_lines() and geom_mean_lines() that caused alpha to not work properly. (v.0.0.9009)
• Improved nfl_team_tiers() by adding the opportunity to modify title, subtitle, caption of the plot. Added functionality to remove tier separation lines for combined tiers. Added functionality to run the function in "developer" mode which means, that team abbreviations will be plotted instead of logos (much faster). (v.0.0.9010)
• Added the geom_nfl_headshots() geom that plots headshots for valid gsis IDs. (v0.0.9011)
• Added the axis scales scale_x_nfl_headshots() and scale_y_nfl_headshots(). (v.0.0.9012)
• Updated internal data to use the new team colors in nflfastR. (v.0.0.9013)
• Added the geom_nfl_wordmarks() geom that plots NFL wordmarks using valid team abbreviations. (v.0.0.9014)
• Added the geom_from_path() geom that plots images from urls, local paths and more. (v.0.0.9015)
• Added the ggplot2 theme-elements element_nfl_logo(), element_nfl_wordmark(),
  element_nfl_headshot(), and element_path() which translate NFL team abbreviations or player IDs into team logos and player headshots. These elements feature a major speed improvement over the axis scales scale_x_nfl_headshots() and scale_y_nfl_headshots() and make the package less dependent on an underlying package. (v.0.0.0.9016)