GDCR 17 in Frankfurt@itemis (#88)
GDCR 17 in Frankfurt@itemis (#88)

* Rename frankfurt.json to frankfurtAmMain.json

* Update frankfurtAmMain.json

As recommended, only twitter handle is given. Title is extended so that the attendees knows the host (itemis).

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