[ADD] 增加bll相关代码，更新flea-model设计
[ADD] 增加bll相关代码，更新flea-model设计
Merge branch 'master' of https://github.com/isleon/flea-market

Conflicts:
	private/db/flea-model.puml
	private/db/flea-model2.png
[UPD]
[UPD] 更新数据库模型
[UPD]
[ADD] 增加图片上传controller：routes/image.js
[UPD]
[UPD]
[ADD] 增加总体架构图
[UPD] 更新架构设计
[UPD] 精简bll/entity.js的逻辑
[UPD]
[UPD]
Merge branch 'master' of https://github.com/isleon/flea-market
[UPD]
[UPD]
Merge branch 'master' into develop

Conflicts:
	app.js
	public/css/style.styl
	routes/index.js
	routes/publish.js
	views/publish.jade