project.date_updated expect to be a string
project.date_updated expect to be a string

timestamps are created/updated on the client, our test should not expect that the server changes it. fixes #79

errietta/publish.webmaker.org,humphd/publish.webmaker.org,humphd/publish.webmaker.org,Pomax/publish.webmaker.org,errietta/publish.webmaker.org,humphd/publish.webmaker.org,errietta/publish.webmaker.org,mozilla/publish.webmaker.org,sedge/publish.webmaker.org,mozilla/publish.webmaker.org,Pomax/publish.webmaker.org,sedge/publish.webmaker.org,sedge/publish.webmaker.org,mozilla/publish.webmaker.org,Pomax/publish.webmaker.org