Update README.md
Remove 'core.js' to 'main.js' and move it into 'core' folder.
update constructor.js
Move array.js, object.js, string.js and README.md from util folder to core folder.
update constructor.js
update constructor.js
update object.js and jigsaw.js
Update README.md
改变核心方法的实现方式
增加 absorb 方法用于批量添加核心工具方法
delete constructor.js
Add validator and default value to string handlers.
update Method-Constructor
add validator and default value to array handlers
update String Struct Data
separate constructor from main.js
update constructor
改变 Constructor 的实现方式
update data structure (main, array, object, string)
update