remove autoplay direction prop

fix clear interval bug

test/routers/carousel.vue

@@ -11,13 +11,6 @@
         <i-col span="4">
             Speed <Slider :value.sync="autoplaySpeed" :min="300" :max="5000"></Slider>
         </i-col>
-        <i-col span="4">
-            <p>Direction</p>
-            <Button-group>
-                <i-button @click="autoplayDirection = 'left'">Left</i-button>
-                <i-button @click="autoplayDirection = 'right'">Right</i-button>
-            </Button-group>
-        </i-col>
         <i-col span="4">
             Switch To
             <Button-group>
@@ -66,7 +59,6 @@
         :current-index.sync="currentIndex"
         :autoplay="autoplay"
         :autoplay-speed="autoplaySpeed"
-        :autoplay-direction="autoplayDirection"
         :dots="dots"
         :trigger="trigger"
         :arrow="arrow"
@@ -193,7 +185,6 @@
                 currentIndex: 0,
                 autoplay: true,
                 autoplaySpeed: 2000,
-                autoplayDirection: 'left',
                 remove: false,
                 pushItem: [],
                 arrow: 'hover',