Maintain a stable version for the production environment.
Merge branch 'sjdbc-1.x' of https://github.com/dangdangdotcom/sharding-jdbc.git
Docs: http://dangdangdotcom.github.io/sharding-jdbc

Changes:
1. The default-data-source does not need to be included in the data-sources. Modified class: ShardingJdbcDataSourceBeanDefinitionParser、ShardingRuleConfig、ShardingRuleBuilder、DataSourceRule.
2. Extend class ShardingValueWrapper to add a format string method.


Add in pom.xml:

<dependencies>
    <dependency>
        <groupId>com.dangdang</groupId>
        <artifactId>sjdbc</artifactId>
        <version>1.3.1</version>
    </dependency>
</dependencies>``