Radboud University, Donders Institute beamer theme

Unofficial style for beamer presentations at Radboud University, Donders Institute, Nijmegen, Netherlands.

This theme uses many elements from: https://tex.stackexchange.com/questions/146529/design-a-custom-beamer-theme-from-scratch

All contributions and suggestions are welcome!

Specific instructions:

to create the title page, use: \titleframe (i.e. not \frame{\titlepage})
to create a section page, use: \sectionframe (i.e. not \frame{\sectionpage})