search chum on map

see egg docs for more detail.

$ npm i
$ npm run dev
$ open http://localhost:7002/

$ npm i
$ npm start
$ open http://localhost:7001/
or [stage](taobaotaoqi.cn:7001/)

$ npm start
$ npm stop

• Use npm run lint to check code style.
• Use npm test to run unit test.
• Use npm run autod to auto detect dependencies upgrade, see autod for more detail.