Merge pull request #20 from mklose/master

logos for new sponsors
added clarification about guarantued participants slots for sponsors
incorporated history text from markus

[skip ci]
redirecting intermediate registration page to Softwerkskammer site
made map on location page smaller. changed some text
added logos for sponsors: Namics, uxebu, innoQ
simplified settings a lot; updated README accordingly

Note, that it's advised to set the env variable DEBUG to "True" during
development.
fixing travis build (and therefore automatic deploy to stage)
change ThoughtWorks logo to TW-DE logo