* add changelist of tsfile and rpc

* fix readme

[IOTDB-143]Development of merge

* Add create matadata interfaces to Session

# Conflicts:
#	jdbc/src/test/java/org/apache/iotdb/jdbc/IoTDBQueryResultSetTest.java
#	server/src/main/java/org/apache/iotdb/db/engine/storagegroup/StorageGroupProcessor.java
#	tsfile/src/main/java/org/apache/iotdb/tsfile/write/writer/TsFileIOWriter.java

Change map key in TsDigest from String to enum data type

* Add ErrorCode of different response errors

change exception message

# Conflicts:
#	client/src/main/java/org/apache/iotdb/client/AbstractClient.java
#	example/session/src/main/java/org/apache/iotdb/JDBCExample.java
#	server/src/main/java/org/apache/iotdb/db/engine/storagegroup/TsFileResource.java
#	server/src/main/java/org/apache/iotdb/db/writelog/recover/TsFileRecoverPerformer.java
#	server/src/test/java/org/apache/iotdb/db/engine/storagegroup/StorageGroupProcessorTest.java

Add a tool to print tsfileResources (each device's start and end time)

Remove unnecessary code and simplify assertEquals to assertFalse or assertTrue

rename FileSchema to Schema

[IOTDB-173] add batch rpc interface

add max concurrent client number