thematic v0.1.2

• Closed #89: {thematic} now works as expected with the {gganimate} package. (#96)
• Closed #93: Better support for {ggplot2} extensions that set geom/scale colour defaults to 0.
• Closed #90: Enabling thematic no longer fails when used with package(s) that register {ggplot2} methods via registerS3method() within .onLoad() ({zoo} is one such package that does this). (#90)
• Closed #86: thematic_rmd() now works as expected in shiny: runtime Rmd documents. (#87)
• Closed #82: Fixed a bug with ggplot2::element_blank() in plot-specific user code not being respected by {thematic}. (#83)