Add vendor dependencies

vendor/git.autistici.org/id/auth/COPYING

vendor/git.autistici.org/id/auth/README.md

vendor/git.autistici.org/id/auth/client/client.go

vendor/git.autistici.org/id/auth/codec.go

vendor/git.autistici.org/id/auth/protocol.go

vendor/git.autistici.org/id/auth/test-config.yml

vendor/git.autistici.org/id/auth/test-users.yml

vendor/github.com/elazarl/go-bindata-assetfs/LICENSE

vendor/github.com/elazarl/go-bindata-assetfs/README.md

vendor/github.com/elazarl/go-bindata-assetfs/assetfs.go

vendor/github.com/elazarl/go-bindata-assetfs/doc.go

vendor/github.com/gorilla/context/LICENSE

vendor/github.com/gorilla/context/README.md

vendor/github.com/gorilla/context/context.go

vendor/github.com/gorilla/context/doc.go

vendor/github.com/gorilla/csrf/Gopkg.lock

vendor/github.com/gorilla/csrf/Gopkg.toml

vendor/github.com/gorilla/csrf/LICENSE

vendor/github.com/gorilla/csrf/README.md

vendor/github.com/gorilla/csrf/context.go