merged some new stuff from odl-hamburg
removed some leftovers from the merge
changed twitter user
updated readme
fixed image sizes & added retina support vor non-svg devices
fixed donate-button image position
adjusted some stuff for responsiveness
Merge branch 'master' of github.com:fwd-io/odl.docpad

Conflicts:
	docpad.coffee
	src/documents/assets/css/styles.css.less
	src/documents/de.html
	src/documents/index.html
Merge branch 'master' of github.com:fwd-io/odl-hamburg