Add additional changedir function
Add additional changedir function

This is only necessary when running the application in production, where the
static files are served differently (e.g. by apache). Without this chdir, the
current .bowerrc file caused the files to be moved to a different subfolder so
that collectstatic could not find them.

kjagoo/wger_stark,petervanderdoes/wger,wger-project/wger,petervanderdoes/wger,wger-project/wger,rolandgeider/wger,rolandgeider/wger,rolandgeider/wger,DeveloperMal/wger,wger-project/wger,kjagoo/wger_stark,petervanderdoes/wger,petervanderdoes/wger,wger-project/wger,kjagoo/wger_stark,DeveloperMal/wger,kjagoo/wger_stark,rolandgeider/wger,DeveloperMal/wger,DeveloperMal/wger