Added an event in Stockholm for GDCR17  (#212)
Added an event in Stockholm for GDCR17  (#212)

* New event added in Stockholm! Woop woop!
Citerus AB will be hosting.

* Updated URL to temporary gist-link

yugangbai/coderetreat.github.io,tpd-opitz/coderetreat.github.io,yugangbai/coderetreat.github.io,tpd-opitz/coderetreat.github.io,svenlange/coderetreat.github.io,coderetreat/coderetreat.github.io,svenlange/coderetreat.github.io,tpd-opitz/coderetreat.github.io,coderetreat/coderetreat.github.io,yugangbai/coderetreat.github.io,coderetreat/coderetreat.github.io,yugangbai/coderetreat.github.io,coderetreat/coderetreat.github.io,svenlange/coderetreat.github.io,svenlange/coderetreat.github.io