Merge pull request #265 from XiaoMi/github-master

Gaea 2.4.2 Synchronization

Merge pull request #172 from XiaoMi/dev

增加登录 capability 设置
make 时，增加 git dirty 检测
make 时，增加 git 版本记录
优化连接池，动态更改连接数量至 [capacity, maxCapacity] 之间
允许 gaea 登录版本配置修改

Release version v1.2.2

Release version v1.2.1

Release version 1.2.0

fix log in manager (#105)

Update .travis.yml (#83)

Merge pull request #58 from eastfisher/fix-aggregation

fix: return 0 when no result in sum()