Authorize via Google, Twitter, and Slack

[luigi]

We definitely want Google and Twitter, and might as well look into the feasability of Slack.

[rabidaudio]

There's an omniauth gem for Slack so it should be pretty trivial. In setup we just specify the team id so that we know they are a member of the cfa slack

[werdnanoslen]

Github auth would also make sense

[achaserandall]

Greetings all, as of today (1/12/16) Brett Duncan and I will work on this project. We expect to meet next week and provide an update on our progress. Meanwhile, we welcome any guidance or direction as we programmed in java and will need to research the Ruby integration. Best