完善gitignore
从er迁移Deferred实现

Fix #1
添加测试
修改版本为0.8.0
Merge pull request #8 from ecomfe/adopt-er

完成0.8.0
Merge pull request #9 from ecomfe/0.8/develop

发布0.8.0
Merge pull request #10 from ecomfe/0.8/release

完成0.8.0版本