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/user.go

@@ -0,0 +1,24 @@
+// Copyright 2014 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 (
+	"fmt"
+)
+
+// User represents a API user.
+type User struct {
+	ID        int64  `json:"id"`
+	UserName  string `json:"username"`
+	FullName  string `json:"full_name"`
+	Email     string `json:"email"`
+	AvatarUrl string `json:"avatar_url"`
+}
+
+func (c *Client) GetUserInfo(user string) (*User, error) {
+	u := new(User)
+	err := c.getParsedResponse("GET", fmt.Sprintf("/users/%s", user), nil, nil, u)
+	return u, err
+}