* update english documents

* refactor zk client

* update documents

* update zkclient

* add quick start document

* update test

* add backend deployment document

* add frontend deployment document

* add system manual

* Supplementary translation

Translated untranslated places

* 1.0.1-release.md

add 1.0.1-release document

* 1.0.2-release.md

add 1.0.2-release document

* 1.0.3-release.md

add 1.0.3-release document

* 1.1.0-release.md

add 1.1.0-release document

* EasyScheduler-FAQ.md

add FAQ document

* Backend development documentation.md

add backend development documentation

* Upgrade documentation.md

add Upgrade documentation

* Frontend development documentation.md

add frontend development documentation

update 1.1.0 release note

* refactor zkMasterClient/zkWorkerClient

* fix bug: close zk links .

* fix bug: close zk links .

* delete unused code

* update zkclient

* refactor zk client.

* update readme

* update readme

* update readme

* update 1.1.0 release note.

* refactor zkMasterClient/zkWorkerClient

* fix bug: close zk links .

* fix bug: close zk links .

* delete unused code

* update zkclient

* refactor zk client.

* update readme

* update readme

* update readme

add lines count

# Conflicts:
#	escheduler-common/src/main/java/cn/escheduler/common/zk/AbstractZKClient.java
#	escheduler-server/src/main/java/cn/escheduler/server/worker/runner/FetchTaskThread.java

worker code optimization