xaringanthemer 0.3.0 (dev)

Adds theme_xaringan(), a ggplot2 theme that automatically uses the colors and font styles of your xaringanthemer style. Also adds scale_xaringan_color() and scale_xaringan_fill() functions that use the primary colors for the color or fill aesthetics. These theme functions currently do not work when knitr caching is enabled and require that the xaringanthemer style functions are called within your xaringan slides Rmd file.
Renamed all xaringanthemer functions that create CSS styles to use the prefix “style_”. For example, mono_light() is now style_mono_light(). Additionally, write_xaringan_theme() is now style_xaringan() and write_extra_css() is style_extra_css(). Overall, this change makes the xarignanthemer API much cleaner and easier to navigate. Previous function names are deprecated but still work.
Added background_header_auto parameter that adds a background under the first h1 element (i.e. # Slide Title) on a slide. When enabled, the background is added automatically to slides, as long as they aren’t inverse, center, middle, or bottom-styled slides. When disabled, you can still enable slide title headers by adding the header_background class to a slide. (thanks, @Btibert3, #10)
The underlying template now uses the whisker package.

Bugfixes and Improvements

Better handling of multiple extra_fonts, including improved error messages. (Thanks @pat-s, #19).
style_extra_css() (previously write_extra_css()) gained an append argument so that it can append to or overwrite an existing file (thanks @pat-s, #17).