Migrate to dep (#3972)

* Update makefile to use dep

* Migrate to dep

* Fix some deps

* Try to find a better version for golang.org/x/net

* Try to find a better version for golang.org/x/oauth2

vendor/github.com/markbates/goth/README.md

@@ -1,141 +0,0 @@
-# Goth: Multi-Provider Authentication for Go [![GoDoc](https://godoc.org/github.com/markbates/goth?status.svg)](https://godoc.org/github.com/markbates/goth) [![Build Status](https://travis-ci.org/markbates/goth.svg)](https://travis-ci.org/markbates/goth)
-
-Package goth provides a simple, clean, and idiomatic way to write authentication
-packages for Go web applications.
-
-Unlike other similar packages, Goth, lets you write OAuth, OAuth2, or any other
-protocol providers, as long as they implement the `Provider` and `Session` interfaces.
-
-This package was inspired by [https://github.com/intridea/omniauth](https://github.com/intridea/omniauth).
-
-## Goth Needs a New Maintainer
-
-[https://blog.gobuffalo.io/goth-needs-a-new-maintainer-626cd47ca37b](https://blog.gobuffalo.io/goth-needs-a-new-maintainer-626cd47ca37b) - TL;DR: I, @markbates, won't be responding to any more issues, PRs, etc... for this package. A new maintainer needs to be found ASAP. Is this you?
-
-## Installation
-
-```text
-$ go get github.com/markbates/goth
-```
-
-## Supported Providers
-
-* Amazon
-* Auth0
-* Azure AD
-* Battle.net
-* Bitbucket
-* Box
-* Cloud Foundry
-* Dailymotion
-* Deezer
-* Digital Ocean
-* Discord
-* Dropbox
-* Eve Online
-* Facebook
-* Fitbit
-* GitHub
-* Gitlab
-* Google+
-* Heroku
-* InfluxCloud
-* Instagram
-* Intercom
-* Lastfm
-* Linkedin
-* Meetup
-* MicrosoftOnline
-* Naver
-* OneDrive
-* OpenID Connect (auto discovery)
-* Paypal
-* SalesForce
-* Slack
-* Soundcloud
-* Spotify
-* Steam
-* Stripe
-* Twitch
-* Twitter
-* Uber
-* VK
-* Wepay
-* Xero
-* Yahoo
-* Yammer
-
-## Examples
-
-See the [examples](examples) folder for a working application that lets users authenticate
-through Twitter, Facebook, Google Plus etc.
-
-To run the example either clone the source from GitHub
-
-```text
-$ git clone git@github.com:markbates/goth.git
-```
-or use
-```text
-$ go get github.com/markbates/goth
-```
-```text
-$ cd goth/examples
-$ go get -v
-$ go build
-$ ./examples
-```
-
-Now open up your browser and go to [http://localhost:3000](http://localhost:3000) to see the example.
-
-To actually use the different providers, please make sure you set environment variables. Example given in the examples/main.go file
-
-## Security Notes
-
-By default, gothic uses a `CookieStore` from the `gorilla/sessions` package to store session data.
-
-As configured, this default store (`gothic.Store`) will generate cookies with `Options`:
-
-```go
-&Options{
-   Path:   "/",
-   Domain: "",
-   MaxAge: 86400 * 30,
-   HttpOnly: true,
-   Secure: false,
- }
-```
-
-To tailor these fields for your application, you can override the `gothic.Store` variable at startup.
-
-The follow snippet show one way to do this:
-
-```go
-key := ""             // Replace with your SESSION_SECRET or similar
-maxAge := 86400 * 30  // 30 days
-isProd := false       // Set to true when serving over https
-
-store := sessions.NewCookieStore([]byte(key))
-store.MaxAge(maxAge)
-store.Options.Path = "/"
-store.Options.HttpOnly = true   // HttpOnly should always be enabled
-store.Options.Secure = isProd
-
-gothic.Store = store
-```
-
-## Issues
-
-Issues always stand a significantly better chance of getting fixed if they are accompanied by a
-pull request.
-
-## Contributing
-
-Would I love to see more providers? Certainly! Would you love to contribute one? Hopefully, yes!
-
-1. Fork it
-2. Create your feature branch (git checkout -b my-new-feature)
-3. Write Tests!
-4. Commit your changes (git commit -am 'Add some feature')
-5. Push to the branch (git push origin my-new-feature)
-6. Create new Pull Request