Remove GoGet option from repository and handle it with ?go-get=1 instead

The normal go get protocol is to show the go-import meta tag when ?go-get=1 is appended to the url. This commit implements that behaviour and cleans the go-get option from the repository settings page.

modules/auth/repo_form.go

@@ -52,7 +52,6 @@ type RepoSettingForm struct {
 	Branch      string `form:"branch"`
 	Interval    int    `form:"interval"`
 	Private     bool   `form:"private"`
-	GoGet       bool   `form:"goget"`
 }
 
 func (f *RepoSettingForm) Validate(ctx *macaron.Context, errs binding.Errors) binding.Errors {

modules/middleware/repo.go

@@ -394,8 +394,7 @@ func RepoAssignment(redirect bool, args ...bool) macaron.Handler {
 		}
 		ctx.Data["CloneLink"] = ctx.Repo.CloneLink
 
-		if ctx.Repo.Repository.IsGoget {
-			ctx.Data["GoGetLink"] = fmt.Sprintf("%s%s/%s", setting.AppUrl, u.LowerName, repo.LowerName)
+		if ctx.Query("go-get") == "1" {
 			ctx.Data["GoGetImport"] = fmt.Sprintf("%s/%s/%s", setting.Domain, u.LowerName, repo.LowerName)
 		}