Update import paths from github.com/go-gitea to code.gitea.io (#135)

- Update import paths from github.com/go-gitea to code.gitea.io
- Fix import path for travis

See https://docs.travis-ci.com/user/languages/go#Go-Import-Path

vendor/code.gitea.io/go-sdk/gitea/admin_repo.go

@@ -0,0 +1,21 @@
+// Copyright 2015 The Gogs Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package gitea
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+)
+
+func (c *Client) AdminCreateRepo(user string, opt CreateRepoOption) (*Repository, error) {
+	body, err := json.Marshal(&opt)
+	if err != nil {
+		return nil, err
+	}
+	repo := new(Repository)
+	return repo, c.getParsedResponse("POST", fmt.Sprintf("/admin/users/%s/repos", user),
+		jsonHeader, bytes.NewReader(body), repo)
+}