Hooks were run for wikis, but given the internal API wasn't responding
failures happended, as seen on:
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/18693

In some cases is prefered to manually create a ProjectWiki over using
Project#wiki. This is because Project#wiki always uses the #owner (which
is a User sometimes) as the
author of the wiki changes but sometimes the owner is a Group and it
doesn't respond to #username