Feature/2014 code of conduct

This change adds the relevant data to get the site working for 2014.

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.