Update traefik dependencies (docker/docker and related) (#1823)

Update traefik dependencies (docker/docker and related)

- Update dependencies
- Fix compilation problems
- Remove vdemeester/docker-events (in docker api now)
- Remove `integration/vendor`
- Use `testImport`
- update some deps.
- regenerate the lock from scratch (after a `glide cc`)

vendor/github.com/google/go-github/github/gists.go

@@ -241,8 +241,13 @@ func (s *GistsService) Edit(ctx context.Context, id string, gist *Gist) (*Gist,
 // ListCommits lists commits of a gist.
 //
 // GitHub API docs: https://developer.github.com/v3/gists/#list-gist-commits
-func (s *GistsService) ListCommits(ctx context.Context, id string) ([]*GistCommit, *Response, error) {
+func (s *GistsService) ListCommits(ctx context.Context, id string, opt *ListOptions) ([]*GistCommit, *Response, error) {
 	u := fmt.Sprintf("gists/%v/commits", id)
+	u, err := addOptions(u, opt)
+	if err != nil {
+		return nil, nil, err
+	}
+
 	req, err := s.client.NewRequest("GET", u, nil)
 	if err != nil {
 		return nil, nil, err