removed empty Attributes from ParagraphProperties

I checked the spec, and "w:pPr" does not take any attributes. I also
converted the paragraph tests to use the deep.equal style to get rid
of some more jsonify!

ts/docx/paragraph/properties.ts

@@ -4,7 +4,6 @@ export class ParagraphProperties extends XmlComponent {
 
     constructor() {
         super("w:pPr");
-        this.root.push(new Attributes());
     }
 
     public push(item: XmlComponent): void {