Merge branch 'enable_gitlab_pipelines' into 'master'

Enable gitlab pipelines for federation lib

See merge request !19

.gitlab-ci.yml

+image: golang:1.9
+variables:
+  SRC_DIR: "/go/src/git.feneas.org/ganggo"
+run unit tests:
+  before_script:
+  - mkdir -p $SRC_DIR
+  - cp -r /builds/ganggo/federation ${SRC_DIR}/federation
+  - cd ${SRC_DIR}/federation
+  - go get -t -v ./...
+  script:
+  - go test -v -race -covermode=atomic

.travis.yml

-language: go
-sudo: false
-go:
-- 1.9.x
-install:
-- go get -t -v ./...
-script:
-- go test -v -race -coverprofile=coverage.txt -covermode=atomic
-after_success:
-- bash <(curl -s https://codecov.io/bash)