* develop:
  [modify for not pSql in taos obj ]
  [TD-476]fixbug: show correct info when user has no permission to open db
  make test case print message one by one.
  fix crash caused by double free

Hotfix/td-476

Hotfix/taos tools

make test case print message one by one.

[modify for not pSql in taos obj ]

* develop: (41 commits)
  [TD-519] fix execute sql return
  fix crash caused by double free when fail to initQInfo
  fix: jdbc resultset
  [TD-314] modify python connector to adapt C API
  [td-225] add query cost statistics.
  [TD-314] modify python connector to adapt the taos API change
  test: importOneRow
  [td-225] update script
  [td-225] update script
  [td-225] update script
  [td-225] update the slow query buffer
  feat: taosdemo, taosdump
  [td-225] fix memory leaks.
  [td-225] add query cost summary right before the qinfo is destoried.
  [td-225] fix memory leaks
  [td-225] update the output log format
  [td-225] fix bugs found by script
  [td-225] handle super table missing error
  [td-225] fix invalid write
  [td-225] fix memory leaks
  ...

fix crash caused by double free when fail to initQInfo

Feature/query

* develop: (43 commits)
  add 3 threads case.
  fix compile error
  [add sim case]
  fix variable issie.
  TD-90
  fix coverity scan bugs
  TD-90
  TD-90
  add multi-threading random test
  TD-90
  fix coverity scan bugs
  [add prepare demo file]
  TD-90
  remove a printf
  [td-90]
  TD-90
  [td-90]
  TD-90
  fix invalid write
  increase travis wait to 20 min
  ...

* 'feature/query' of github.com:taosdata/TDengine:
  [TD-314] modify python connector to adapt C API
  [td-225] add query cost statistics.
  [TD-314] modify python connector to adapt the taos API change

Feature/2.0tsdb

fix variable issie.

[add sim case]

add multi-threading random test

[TD-517]

[TD-489]

Hotfix/fileinfo