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/signature.go

@@ -0,0 +1,48 @@
+// 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"
+	"strconv"
+	"time"
+)
+
+// Signature represents the Author or Committer information.
+type Signature struct {
+	Email string
+	Name  string
+	When  time.Time
+}
+
+// Helper to get a signature from the commit line, which looks like these:
+//     author Patrick Gundlach <gundlach@speedata.de> 1378823654 +0200
+//     author Patrick Gundlach <gundlach@speedata.de> Thu, 07 Apr 2005 22:13:13 +0200
+// but without the "author " at the beginning (this method should)
+// be used for author and committer.
+//
+// FIXME: include timezone for timestamp!
+func newSignatureFromCommitline(line []byte) (_ *Signature, err error) {
+	sig := new(Signature)
+	emailStart := bytes.IndexByte(line, '<')
+	sig.Name = string(line[:emailStart-1])
+	emailEnd := bytes.IndexByte(line, '>')
+	sig.Email = string(line[emailStart+1 : emailEnd])
+
+	// Check date format.
+	firstChar := line[emailEnd+2]
+	if firstChar >= 48 && firstChar <= 57 {
+		timestop := bytes.IndexByte(line[emailEnd+2:], ' ')
+		timestring := string(line[emailEnd+2 : emailEnd+2+timestop])
+		seconds, _ := strconv.ParseInt(timestring, 10, 64)
+		sig.When = time.Unix(seconds, 0)
+	} else {
+		sig.When, err = time.Parse("Mon Jan _2 15:04:05 2006 -0700", string(line[emailEnd+2:]))
+		if err != nil {
+			return nil, err
+		}
+	}
+	return sig, nil
+}