[GinS] Gindex needs to be added to travis

.travis.yml

@@ -15,5 +15,6 @@ env:
 script:
   - go get github.com/G-Node/gin-doi/src
   - go get gopkg.in/yaml.v2
+  - go get github.com/G-Node/gin-dex/gindex
   - go build -v -tags "pam"
   - go test -v -cover -race ./...