add Toulouse 2018 event (#456)
add Toulouse 2018 event (#456)

* add Toulouse 2018 event

* add moderators for Toulouse

coderetreat/coderetreat.github.io,coderetreat/coderetreat.github.io,svenlange/coderetreat.github.io,svenlange/coderetreat.github.io,coderetreat/coderetreat.github.io,svenlange/coderetreat.github.io,coderetreat/coderetreat.github.io,svenlange/coderetreat.github.io