Merge pull request #111 from cherrylzhao/dev

to clean the docker container , you could use docker rm `docker ps -a -q` (be careful)

## sharding-sphere-example module design

```

sharding-sphere-example

  ├── example-common

  │   ├── config-utility

  │   ├── repository-api

  │   ├── repository-jdbc

  │   ├── repository-jpa

  │   └── repository-mybatis

  ├── sharding-jdbc-example

  │   ├── orchestration-example

  │   │   ├── orchestration-raw-jdbc-example

  │   │   ├── orchestration-spring-boot-example

  │   │   ├── orchestration-spring-namespace-example

  │   ├── sharding-example

  │   │   ├── sharding-raw-jdbc-example

  │   │   ├── sharding-spring-boot-jpa-example

  │   │   ├── sharding-spring-boot-mybatis-example

  │   │   ├── sharding-spring-namespace-jpa-example

  │   │   └── sharding-spring-namespace-mybatis-example

  │   └── transaction-example

  │       ├── transaction-2pc-xa-example

  │       └── transaction-base-saga-example

  ├── sharding-proxy-example

  │   └── sharding-proxy-boot-mybatis-example

  ├── src/resources

  │    ├── manual_schema.sql

```