recover when resource file does not exist while tsfile is complete

fix file name compare bug

* add statstic while restore an uncomplete tsfile

* add ut test and fix a bug of Statistics when restoring

* fix a bug in PageHeaderTest

* add time cost statstic

* Add documents in Chinese and fix links in English documents

* Enabled TsFile registering the measurements by JSON, example provided

* rename a class and modify some comments

* Enabled TsFile write by JSON, example provided

* Combined two write examples together, readme also updated

* add IOTDB_HOME prefix to dir

Separate documents into different chapter folders

*  New Storage Engine. BufferwriteProcessor, OverflowProcessor, FileNodeProcessor and FileNodeManager are replaced by UnsealedTsFileProcessor, UnsealedTsFileProcessor, StorageGroupProcessor and StorageGroupManager.

* Async Flush Processor

* QueryDataSource is modified to adapt the new storage engine.

* Data dir is modified. TsFile.restore, FileNode.restore are discarded.

* a new tsfile summary file: tsfile.resource.

* Overflow file is isomorphic with Tsfile.

* A new chunk structure: TVList

* Each tsfile has a WAL file.

* Add some config parameters: memTableNumber, chunkBufferPoolEnable. 

* System_dir is discarded.

fix a  grammar mistake in docs

a small grammar mistake and should be "a device".

fix system memory check in iotdb-env.sh

update Travic.yaml to suppress mvn log

remove win-oracleJDK11 and Linux-OracleJDK11 on travis-ci temporary.

* add sync docu

* modify sync docu according to pr review

* multi-directories avoid using disk without space

* fix that MManager is incorrectly recovered when system reboots

* clean overflow files when storage group is deleted

Fix a doc bug of QuickStart.md

The word colomn should be column.

simplify Path construction, which improves 17% write speed

[IOTDB-107]fix missing wal log node after recovery

* organize properties

* add time unit