add a processor Class of manifest-compiler

1.add a processor Class of manifest-compiler.js  which can add manifest attribute to html and create manifest file.
2.add util file of get-css-url.js which can return urls array in css file.
3.add util file of get-tag-attribute.js which can retrun attribute array of tag in html file.
4.modify index.js that add ManifestCompiler to injectProcessor function