allow NA values
changed default font to arial
added unique to Array JS
fixed bug when colors > 20 (remove transparency)
Added Show one/all
renamed Group to Groups
added font parameter
Merge branch 'develop'

* develop:
  added font parameter
  Added Show one/all renamed Group to Groups
  fixed bug when colors > 20 (remove transparency)
  changed default font to arial added unique to Array JS
  allow NA values