feat: Add Bin.border to control space to edge

test(maxrects-bin.spec.js): Tightening test code on border/padding
fix #5

TODO

@@ -4,9 +4,14 @@
 ✔ 更新README.md @done(19-05-26 17:34)
 ✔ Test增加Generic type部分 @done(19-05-26 17:04)
 ✔ 发布2.1.0版 @done(19-05-26 18:20)
-☐ 增加Bin.border控制参数
+✔ 增加Bin.border控制参数 @started(19-06-11 18:08) @done(19-06-11 18:31) @lasted(23m35s)
+    ✔ 修正Bin.border错误 @started(19-06-11 21:56) @done(19-06-12 02:56) @lasted(5h51s)
+    ✔ 完善border部分test @done(19-06-12 02:56)
 ✔ `hash`二次排序 @done(19-06-04 15:39)
 ☐ 完善注释和文档
     ✔ 发布gh-pages @done(19-06-04 15:39)
 ✔ 增加翻片儿`next()` @done(19-06-04 15:39)
-✔ 根据tag自动分配Bin @done(19-06-06 00:32) @lasted(12s)
+✔ 根据tag自动分配Bin @done(19-06-06 00:32) @lasted(12s)
+☐ 增加isDirty状态
+    ✔ MaxRectsBin.isDirty @done(19-06-11 18:08)
+    ☐ Rectangle.isDirty

dist/maxrects-packer.d.ts

@@ -154,6 +154,7 @@ interface IOption {
     square?: boolean;
     allowRotation?: boolean;
     tag?: boolean;
+    border?: number;
 }
 declare class MaxRectsPacker<T extends IRectangle = Rectangle> {
     width: number;
@@ -250,6 +251,7 @@ declare class MaxRectsBin<T extends IRectangle = Rectangle> extends Bin {
     rects: IRectangle[];
     private verticalExpand;
     private stage;
+    private border;
     constructor(maxWidth?: number, maxHeight?: number, padding?: number, options?: IOption);
     add(rect: T): T | undefined;
     add(width: number, height: number, data: any): Rectangle | undefined;