support insert many rows in section

Sources/TableDirector.swift

@@ -230,7 +230,6 @@ public class TableDirector: NSObject, UITableViewDataSource, UITableViewDelegate
     
     public func append(sections sections: [TableSection]) -> Self {
         
-        sections.forEach { $0.tableDirector = self }
         self.sections.appendContentsOf(sections)
         return self
     }

Sources/TableSection.swift

@@ -21,9 +21,7 @@
 import UIKit
 
 public class TableSection {
-    
-    weak var tableDirector: TableDirector?
-    
+
     public private(set) var rows = [Row]()
     
     public var headerTitle: String?
@@ -78,10 +76,14 @@ public class TableSection {
         self.rows.appendContentsOf(rows)
     }
     
-    public func insert(row row: Row, atIndex index: Int) {
+    public func insert(row row: Row, at index: Int) {
         rows.insert(row, atIndex: index)
     }
     
+    public func insert(rows rows: [Row], at index: Int) {
+        self.rows.insertContentsOf(rows, at: index)
+    }
+    
     public func delete(index index: Int) {
         rows.removeAtIndex(index)
     }