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/git/blob.go

@@ -0,0 +1,30 @@
+// 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 git
+
+import (
+	"bytes"
+	"io"
+)
+
+// Blob represents a Git object.
+type Blob struct {
+	repo *Repository
+	*TreeEntry
+}
+
+// Data gets content of blob all at once and wrap it as io.Reader.
+// This can be very slow and memory consuming for huge content.
+func (b *Blob) Data() (io.Reader, error) {
+	stdout, err := NewCommand("show", b.ID.String()).RunInDirBytes(b.repo.Path)
+	if err != nil {
+		return nil, err
+	}
+	return bytes.NewBuffer(stdout), nil
+}
+
+func (b *Blob) DataPipeline(stdout, stderr io.Writer) error {
+	return NewCommand("show", b.ID.String()).RunInDirPipeline(b.repo.Path, stdout, stderr)
+}