Add ggplot2 support und bump to v0.2.0

Change-Id: Iee69051bc64fb9fbde55bbea61c7e892ff95229d
diff --git a/NAMESPACE b/NAMESPACE
index b10031b..f3d776b 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -3,6 +3,19 @@
 export(hc_theme_ids_dark)
 export(hc_theme_ids_light)
 export(hc_theme_ids_mono)
+export(ids_pal)
+export(scale_color_ids)
+export(scale_colour_ids)
+export(scale_fill_ids)
+export(theme_ids)
 import(highcharter)
 import(tidyverse)
+importFrom(ggplot2,discrete_scale)
+importFrom(ggplot2,element_blank)
+importFrom(ggplot2,element_line)
+importFrom(ggplot2,element_rect)
+importFrom(ggplot2,element_text)
+importFrom(ggplot2,theme)
+importFrom(ggthemes,gdocs_pal)
 importFrom(magrittr,"%>%")
+importFrom(scales,manual_pal)