update the master branch to the latest

src/components/icon/icon.vue

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+<template>
+    <i :class="classes" :style="styles" @click="handleClick"></i>
+</template>
+<script>
+    const prefixCls = 'ivu-icon';
+
+    export default {
+        name: 'Icon',
+        props: {
+            type: {
+                type: String,
+                default: ''
+            },
+            size: [Number, String],
+            color: String,
+            custom: {
+                type: String,
+                default: ''
+            }
+        },
+        computed: {
+            classes () {
+                return [
+                    `${prefixCls}`,
+                    {
+                        [`${prefixCls}-${this.type}`]: this.type !== '',
+                        [`${this.custom}`]: this.custom !== '',
+                    }
+                ];
+            },
+            styles () {
+                let style = {};
+
+                if (this.size) {
+                    style['font-size'] = `${this.size}px`;
+                }
+
+                if (this.color) {
+                    style.color = this.color;
+                }
+
+                return style;
+            }
+        },
+        methods: {
+            handleClick (event) {
+                this.$emit('click', event);
+            }
+        }
+    };
+</script>

src/components/icon/index.js

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+import Icon from './icon.vue';
+export default Icon;