Update for 2014 and add Code of Conduct

This change adds the relevant data to get the site working for 2014. It seemed much easier for my to do this today rather then deploying Project Zeppelin now.

The agenda.json for 2014 is not yet existing but the site handles it by displaying a link to the CfP.

Also I adopted the PyCon Code of Conduct and integrated it into our website. Please read it and suggest changes. [Easy read here](https://github.com/devfest-berlin/code-of-conduct/blob/master/code_of_conduct.md)


Following the gitflow model this change is merged against develop and will be needed to released afterwards to be public.