fix #64 set databaseId before parse mapper xmls #81
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when parse mapper xml files , it needs to know what databaseId is。
org.apache.ibatis.builder.xml.XMLConfigBuilder'smethod:databaseIdProviderElement,will set databaseId if "environment != null && databaseIdProvider != null",but the configuration's environment is null becase it will be seted after "xmlConfigBuilder.parse();" in file "SqlSessionFactoryBean.java"