added github from scratch to blog. added philipp to authors. refreshed diana's discription
added pictures for new blogpost github from scratch
modified teaser
bugfix on teasermessage
updated date
Delete 2013-12-03-githubfromscratch-hamburg-december.md

deleted this file because I updated the date of the blogpost and this needs to rename the file..
Merge pull request #63 from fabiansch/gh-pages

added github from scratch. added philipp to authors. refreshed dianas description