truffle3.0以上的项目目录结构中没有app目录怎么办

个人了解比较晚刚开始学习环境已经到3.0版本以后了，教程上大部分是2.0版本的项目目录，导致刚开始学的时候纠结了很久，通过网上查资料找到了答案。

初始化命令这样写就OK了

truffle init webpack 

用这个指令进行初始化然后编译启动就行了，这个初始化过程有点慢，可能是个人网络问题吧。操作如下：

houtongdeMac-mini:demobasic zhou$ truffle init webpackDownloading project...Installing dependencies...Project initialized.  Documentation: https://github.com/trufflesuite/truffle-init-webpackCommands:  Compile:        truffle compile  Migrate:        truffle migrate  Test:           truffle test  Build Frontend: npm run build  Run Linter:     npm run lint  Run Dev Server: npm run devHint: Run the dev server via `npm run dev` to have your changes rebuilt automatically.Make sure you have an Ethereum client like the ethereumjs-testrpc running on http://localhost:8545.

初始化完成后提示出了Commands按照这个进行操作就可以了。
根据提示看出来运行的时候使用的指令是：

npm run dev

结果如下：

ZhoutongdeMac-mini:demobasic zhou$ npm run dev> truffle-init-webpack@0.0.2 dev /Users/zhou/eth/demobasic> webpack-dev-serverProject is running at http://localhost:8080/webpack output is served from /Hash: 7c7d6651ad8059c28eb8Version: webpack 2.7.0Time: 1827ms     Asset       Size  Chunks                    Chunk Names    app.js    1.35 MB       0  [emitted]  [big]  mainindex.html  925 bytes          [emitted]         chunk    {0} app.js (main) 1.32 MB [entry] [rendered]   [82] ./~/web3/index.js 193 bytes {0} [built]   [86] ./app/javascripts/app.js 3.64 kB {0} [built]   [87] (webpack)-dev-server/client?http://localhost:8080 5.83 kB {0} [built]   [88] ./build/contracts/MetaCoin.json 2.59 kB {0} [built]  [127] ./~/loglevel/lib/loglevel.js 6.74 kB {0} [built]  [161] ./~/strip-ansi/index.js 161 bytes {0} [built]  [163] ./~/style-loader/addStyles.js 6.91 kB {0} [built]  [164] ./app/stylesheets/app.css 905 bytes {0} [built]  [171] ./~/truffle-contract/index.js 2.64 kB {0} [built]  [206] ./~/url/url.js 23.3 kB {0} [built]  [241] (webpack)-dev-server/client/overlay.js 3.6 kB {0} [built]  [242] (webpack)-dev-server/client/socket.js 856 bytes {0} [built]  [244] (webpack)/hot nonrecursive ^\.\/log$ 160 bytes {0} [built]  [245] (webpack)/hot/emitter.js 77 bytes {0} [built]  [247] multi (webpack)-dev-server/client?http://localhost:8080 ./app/javascripts/app.js 40 bytes {0} [built]     + 233 hidden moduleswebpack: Compiled successfully.