Implement git refs API for listing references (branches, tags and other) (#5354)

* Inital routes to git refs api

* Git refs API implementation

* Update swagger

* Fix copyright

* Make swagger happy add basic test

* Fix test

* Fix test again :)

vendor/gopkg.in/src-d/go-git.v4/worktree_windows.go

@@ -0,0 +1,35 @@
+// +build windows
+
+package git
+
+import (
+	"os"
+	"syscall"
+	"time"
+
+	"gopkg.in/src-d/go-git.v4/plumbing/format/index"
+)
+
+func init() {
+	fillSystemInfo = func(e *index.Entry, sys interface{}) {
+		if os, ok := sys.(*syscall.Win32FileAttributeData); ok {
+			seconds := os.CreationTime.Nanoseconds() / 1000000000
+			nanoseconds := os.CreationTime.Nanoseconds() - seconds*1000000000
+			e.CreatedAt = time.Unix(seconds, nanoseconds)
+		}
+	}
+}
+
+func isSymlinkWindowsNonAdmin(err error) bool {
+	const ERROR_PRIVILEGE_NOT_HELD syscall.Errno = 1314
+
+	if err != nil {
+		if errLink, ok := err.(*os.LinkError); ok {
+			if errNo, ok := errLink.Err.(syscall.Errno); ok {
+				return errNo == ERROR_PRIVILEGE_NOT_HELD
+			}
+		}
+	}
+
+	return false
+}