* add a restorable tsfile writer without restore file

* fix float precision in PrimitiveMemTableTest

temporary deactive win10+oracleJDK11 on travis

* Refactor some files to reduce sonar bugs.

* add wal checker

* fix show timeseries IT test

* fix #31. add props of a time series declarison into FileNodeProcessor; pick Compressor out of props

* fix bug and optimize checkMetadata parameters logic

* add float precision it

* add NotImplementedException

* control the float precision of data in memtable when query

* modify a UNCOMPRESSOR to UNCOMPRESSED

* fix max_point_number in show timeseries as lowercase

* force require apache-rat check for travis, but omit mvn apache-rat:check on  Linux+OpenJDK11 and Win OS.

* add docker/Dockerfile for building a docker image according to the master branch

* add how to use dockerfile into the docs

* fix bug in TsFileSequenceReader.readPageHeader()

* update read logic of TsFileSequenceReader

* remove duplicate code in Statistics

* replace f.delete() with Assert.assertTrue(f.delete())

* update UT for PageHeader and TsFileSequenceReader

* fix #31. add props of a time series declarison into FileNodeProcessor; pick Compressor out of props

* fix ITs Tests and some bugs added by modifying mmanager

* fix bug and optimize checkMetadata parameters logic

* add float precision it

* add NotImplementedException

* Bug fix: use two maps to avoid getting wrong FileReader

* fix by comments

* fix a null pointer problem

* fix issue #29

[IOTDB-27]Bug fix: the writer of LocalTextModificationAccessor is not recycled 

* add demo of kafka

* add demo of rocketmq

* add readme of example project

* fix a mistake in IoTDBConnectionParams in jdbc module

* add examples as a module

[IOTDB-25] Add some doc in user guide for JMX MBean Monitor

Add test: testDelAfterFlush in IoTDBDeletionIT.

Fixes for non working links in documentation.

refactor lock and unlock in  recovery() of fileNodeManager [WIP]

Fix sonar bugs

# Conflicts:
#	iotdb-cli/src/main/java/org/apache/iotdb/cli/client/AbstractClient.java
#	iotdb-cli/src/main/java/org/apache/iotdb/cli/client/Client.java
#	iotdb-cli/src/main/java/org/apache/iotdb/cli/client/WinClient.java

add an initial committer: Kun Liu

add apache license for docs/*

* add configuration rpc_address for customize listen address