* import bats for cli test

  https://github.com/sstephenson/bats

* add simple test case for cli use bats

* format main.bats add env

* replace main_test.sh with main.bats

  make explain suggestion sorted
  make index suggestion sorted

* add test database world_x

* update bats golden result

* make docker add 180s timeout

  1. add timeout for docker start
  2. add not explain able sql test case into explain_test.go

* explain info Using index VS Using index condition

  remove nonappearence key from explain extra info

* add timeout for test

  COL.015 text/blob default value only tobe `NULL`;
  COL.012 text/blob `NOT NULL` CONSTRAINT may be danagerous;

  RemoveSQLComment trim space

  1. go version move into Makefile
  2. add golden test for ast
  3. explainAbleSQL use tidb parser also