Refactor Hugo version

Put version handling into the helpers package so it can be used by many,
and split version and suffix to make it possible to calculate the next Hugo version.

hugolib/hugo.go

@@ -1,11 +1,11 @@
 package hugolib
 
 import (
+	"fmt"
+	"github.com/spf13/hugo/helpers"
 	"html/template"
 )
 
-const Version = "0.14-DEV"
-
 var (
 	CommitHash string
 	BuildDate  string
@@ -23,9 +23,9 @@ type HugoInfo struct {
 
 func init() {
 	hugoInfo = &HugoInfo{
-		Version:    Version,
+		Version:    helpers.HugoVersion(),
 		CommitHash: CommitHash,
 		BuildDate:  BuildDate,
-		Generator:  `<meta name="generator" content="Hugo ` + Version + `" />`,
+		Generator:  template.HTML(fmt.Sprintf(`<meta name="generator" content="Hugo %s" />`, helpers.HugoVersion())),
 	}
 }