set parsing incorrect cmd as tracing level log in ParseDriver; set TsserviceImple failed executing as info leve log (#153)

* make TsFileWriter as AutoClosable; make TsFileReadWriteTest more concise

[IOTDB-82] close TsFileInput before remove the tsfile

[IOTDB-81]update travis for supporting JDK11 on Win

* add java doc
enhance concurrency
refine some naming
add more specific logs

* fix invalid write when memory usage level is dangerous in BufferWriteProcessor
add shutdown hook to report memory usage

* undo time update when insertion failed

* complete undo logic

* remove undo in exception

* fix an unproperly initialized var

* add feature get for merge result, handle the merge exception

* fix invalid write when memory usage level is dangerous in BufferWriteProcessor

* add shutdown hook to report memory usage

* undo time update when insertion failed

* add a log appender: put info, ware, error log into one file; disable the log_info file

* fix the future instance is replaced when the flush frequency is high

* throw exception when flushing failed

* throw exception when flushing failed

* bug fix: version files of different storage groups are placed into the same place.

* add -B to mvn

* fix_bug_of_read_with_filter

* add hasCachedRowRecord

replace renameTo() with FileUtils.moveFile()

remove system.exit() on Test for better checking the problem when running test

add_create_ts_operator and add grant and revoke for create timeseries

[IOTDB-37]A WAL check tool script is desired

* realize reader for aggregation

* realize aggregate function interface

* add aggregation in qp

* add test

* optimization last and max_time aggregate query that has only time filter or no filter

* add aggregate function with value filter

* modify for pr review suggestion

* fix bug of IOTDB-54

* group by

* add groupby test and fix groupBy bug

* fill query

* modify pr review

* provide unified query resource control interface in QueryResourceManager.

* bug fix: multiple queries in the same statement will cause resource leak.

* optimization of query with value filter by push down filter

* Minor modification of README.md, Recommend to use `mvnw`

* Rename Readme.md to README.md

* add +x permission to mvnw

upload start walchecker script into /iotdb/bin

add test cases for time encoding

move all generated tsfiles for test into the target folder

[IOTDB-70][IOTDB-71]fix jira issue 70 71

Serialize physical plan

Fix close bug of sync thread