[html5] extract render core and plugins from full verison.

[MrRaindrop]

This pr separate vue-render into two parts: render core and plugins.

The render core includes all the basic function for render to work, and the basic components which are text, image, div and the scrollable components and their child components such as cell, header for list and scroller.

The plugins part is the extended built-in components and API modules. Components like a and video are not always used in user's project, therefore it's a big waste for bandwidth and bundle size to integrate these components into render core part. For this sake I package the components into npm packages, and now users can import the corresponding npm package into their project if they use a plugin component.

And I also change some packing logic in build config files, so that you can pack up all the plugins and the render core by just using a certain npm script.

I also adjust some test files since the file structure of components and modules have been changed into installable modules.

[weex-bot]

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