Update Ruby version to v.2.1.2.
Describe how to use RVM.
Update Termin OK Lab Hamburg
Merge pull request #203 from philippgeisler/patch-2

Update Termin OK Lab Hamburg
Merge pull request #201 from johnjohndoe/update-ruby-version

Update Ruby version to v.2.1.2.
summit blogpost
add hashtag to summit
Remove duplicate project entry "Ernte teilen".