* Add FileUtilsTest.java , the unit test for FileUtils (#1493)

* #839 enhancement : add Spark Task Component can switch Spark Version (#1494)

* add Spark Version in Spark Component

add Spark Version in Spark Component

* add license for SparkVersion.class

add license

* 1 add spark task UT
2 add spark version param check

* add assert check for sparkTaskTest

* fix AbstractTask's handle method exception (#1490)

* fix AbstractTask's handle method exception

* update ut

* add ZkServer for UT (#1499)

* add ZkServer for UT

* Add FileUtilsTest.java , the unit test for FileUtils (#1493) (#1)

* updates for reference ZkServer

* DAG automatic layout (#1497)

* Password verification and v-for add key

* DAG automatic layout

* Add common utils CollectionUtils.java DateUtils.java unit test (#1496)

* dateutil test

* pom.xml

* Update README_zh_CN.md

* Update README.md

* Add ExcelUtilsTest.java , the unit test for ExcelUtils (#1500)

* fix issue:1477 some tasks would be running all the time when db delayed(#1477) (#1501)

* fix issue:1477 some tasks would be running all the time when db delayed

* fix issue:1477 some tasks would be running all the time when db delayed

* fix issue:1477 some tasks would be running all the time when db delayed

* change npm run build:combined to npm burn build:release (#1504)