Feature: add Image component

[why520crazy]

Add Image Components for display and preview.

Add thyImage directive

<img thyImage thySrc="/example/a-thumbnail.png" thyPreviewSrc="/example/a-preview.png" thyOriginSrc="/example/preview.png" />

• thyPreviewSrc: image preview src
• thyOriginSrc: image origin src

Add thy-image-group components

 <thy-image-group>
      <img thyImage width="200px" thySrc="/example/a-thumbnail.png" alt="" />
      <img thyImage width="200px" thySrc="/example/a-thumbnail.png" alt="" />
 </thy-image-group>

Add ThyImageService

const images = [
      {
        src: '/example/a-preview.png',
        width: '200px',
        height: '200px',
        alt: 'Tethys'
      },
      {
        src: '/example/b-preview.png',
        width: '200px',
        height: '200px',
        alt: 'Angular'
      }
    ];
this.imageService.preview(images, options: ThyImagePreviewOptions);