Vendor godep v79 and use it

vendor/github.com/tools/godep/version.go

@@ -0,0 +1,63 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"runtime"
+	"strconv"
+	"strings"
+)
+
+const version = 79
+
+var cmdVersion = &Command{
+	Name:  "version",
+	Short: "show version info",
+	Long: `
+
+Displays the version of godep as well as the target OS, architecture and go runtime version.
+`,
+	Run: runVersion,
+}
+
+func versionString() string {
+	return fmt.Sprintf("godep v%d (%s/%s/%s)", version, runtime.GOOS, runtime.GOARCH, runtime.Version())
+}
+
+func runVersion(cmd *Command, args []string) {
+	fmt.Printf("%s\n", versionString())
+}
+
+func GoVersionFields(c rune) bool {
+	return c == 'g' || c == 'o' || c == '.'
+}
+
+// isSameOrNewer go version (goA.B)
+// go1.6 >= go1.6 == true
+// go1.5 >= go1.6 == false
+func isSameOrNewer(base, check string) bool {
+	if base == check {
+		return true
+	}
+	if strings.HasPrefix(check, "devel-") {
+		return true
+	}
+	bp := strings.FieldsFunc(base, GoVersionFields)
+	cp := strings.FieldsFunc(check, GoVersionFields)
+	if len(bp) < 2 || len(cp) < 2 {
+		log.Fatalf("Error comparing %s to %s\n", base, check)
+	}
+	if bp[0] == cp[0] { // We only have go version 1 right now
+		bm, err := strconv.Atoi(bp[1])
+		// These errors are unlikely and there is nothing nice to do here anyway
+		if err != nil {
+			panic(err)
+		}
+		cm, err := strconv.Atoi(cp[1])
+		if err != nil {
+			panic(err)
+		}
+		return cm >= bm
+	}
+	return false
+}