Expanded Editor.md

Expanded of member methods and properties

### Expanded Editor.md

```javascript
var testEditor;

function EditormdExtend() {

this.extend("methodC", function() {
        console.log("methodC");
    });

// or
    testEditor.extend("methodA", function() {
        console.log("methodA");
    });

// one by one setting
    this.set("propertyA", "propertyA");
    this.set("methodE", function() {
        console.log("mothodE", this);
    });

// mutil
    this.extend({
        propertyA : "propertyAAAA", // override, you can override other default method.
        propertyB : "propertyB",
        methodD : function() {
            console.log("methodD");
        }
    });

this.methodB = function() {
        console.log("methodB");
    };

testEditor.methodA();
    testEditor.methodB();
    this.methodC();
    this.methodE();
    editormd.methodOne();

console.log(this, this.propertyA);
}

editormd.fn.customMethod = function(){
    console.log("customMethod", this);
};

$(function() {
    editormd.methodOne = function(){
        console.log("editormd.methodOne");
    };

testEditor = editormd("test-editormd", {
        width  : "90%",
        height : 720,
        path   : '../lib/',
        onload : function() {
            this.customMethod();
            $.proxy(EditormdExtend, this)();
        }
    });

editormd.methodOne();
});
```