Fix use of default repository for bar chart page

There was still a problem with the default repository for the accuracy
bar chart page. This commit fixes that.

Signed-off-by: Konrad Reiche <konrad.reiche@gmail.com>
Add CoffeeScript for the bar chart diagram

I have forgotten to add the CoffeeScript file for generating the bar
chart diagram. This commit adds it now.

Signed-off-by: Konrad Reiche <konrad.reiche@gmail.com>