opti: yapi-cli to yapi and fix install plugin findPlugin name bug

Author: hellosean1025

package.json

@@ -1,11 +1,11 @@
 {
   "name": "yapi-cli",
-  "version": "1.1.5",
+  "version": "1.1.6@rc",
   "description": "",
   "main": "index.js",
   "bin": {
-    "yapi-cli": "./bin/yapi-cli",
-    "yapi"    : "./bin/yapi-cli"
+    "yapi": "./bin/yapi-cli",
+    "yapi-cli": "./bin/yapi-cli"
   },
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1"

src/commands/plugin.js

@@ -35,9 +35,14 @@ module.exports = {
       }
 
       let pluginName = name.substr('yapi-plugin-'.length)
-      if (_.find(config.plugins, { name: pluginName })) {
-        throw new Error('此插件已安装');
-      } else if (_.find(config.plugins, p=> p == pluginName)) {
+      if (_.find(config.plugins, plugin=>{
+        if(!plugin) return null;
+        if(typeof plugin === 'string'){
+          return plugin == pluginName;
+        }else if(typeof plugin === 'object'){
+          return plugin.name == pluginName
+        }
+      })) {
         throw new Error('此插件已安装');
       }
       shell.cd('vendors');