重构密集计算，使用Go

1. install imagick homebrew install imagemagick --universal to build fat binaries.

2. install go, prepare go dev env.

3. install go modules(third party modules in import)

4. go build main.go config.go logger.go

5. run ./main , run test.js

1. main goroutine listens to redis message
2. Once a message comming, start a goroutine to process image
3. In config.go MAXWORKER to control the maxium workers that process at the same time
4. Current, only wirte resize action.
5. If there is a scalable issue, static language should be adopted.
6. php can be adopted to implement the idea.