Automatic less-file compiling

[florianfendt]

Currently I'm always doing this manually on my machine and then copy the css files into our project. It's possible though to automate this process and have grunt compile files on each commit / change in less-files. We should set this up when we have some spare time, in the long run it could safe a lot of time. Here's a link on how to do this: https://www.tjvantoll.com/2012/07/07/the-ideal-less-workflow-with-git/