Milestone issues and pull requests (#5293)

* add milestone issues and pulls page instead of redirecting issues page

* add milestone when creating issue from milestone page

* refactor to merge similiar codes as a new function issues

* remove milestone info on milestone issues list

* fix missing params

models/issue_milestone.go

@@ -122,6 +122,18 @@ func GetMilestoneByRepoID(repoID, id int64) (*Milestone, error) {
 	return getMilestoneByRepoID(x, repoID, id)
 }
 
+// GetMilestoneByID returns the milestone via id .
+func GetMilestoneByID(id int64) (*Milestone, error) {
+	var m Milestone
+	has, err := x.ID(id).Get(&m)
+	if err != nil {
+		return nil, err
+	} else if !has {
+		return nil, ErrMilestoneNotExist{id, 0}
+	}
+	return &m, nil
+}
+
 // MilestoneList is a list of milestones offering additional functionality
 type MilestoneList []*Milestone