initialize carousel

src/components/carousel/carousel-item.vue

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+<template>
+    <div :class="prefixCls"><slot></slot></div>
+</template>
+<script>
+    const prefixCls = 'ivu-carousel-item';
+
+    export default {
+        name: 'CarouselItem'
+    };
+</script>

src/components/carousel/carousel.vue

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+<template>
+    <div :class="prefixCls">
+    </div>
+</template>
+<script>
+    const prefixCls = 'ivu-cascader';
+
+    export default {
+        name: 'Carousel'
+    };
+</script>

src/components/carousel/index.js

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+import Carousel from './carousel.vue';
+import CarouselItem from './carousel-item.vue';
+
+Carousel.Item = CarouselItem;
+export default Carousel;