fixes StudentInfDBAdapter.saveTwodimensionalMap throws NPE if value is null

修复 当内层map的值为null时，StudentInfDBAdapter.saveTwodimensionalMap会抛出NullPointerException的问题
add dependencies on website-parser-tjut-proxy-api and -proxy-gae-client

新增 对website-parser-tjut-proxy-api和website-parser-tjut-proxy-gae-client的依赖