change `connect` to `docker-connect`
  add `docker-it` for attaching into container

  RuleTimePrecision
  MySQL 5.6.4+ New time data type, support time precision to microsecond

  go test ./... -update

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

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

  1. Makefile add `daily-quick` let test more fast
  2. Heuristic rule word lint
  3. FUN.001 add more logic, unstable now

  MYSQL_RELEASE=percona MYSQL_VERSION=5.7 make docker

  #5
    Go version large than 1.8 has default GOPATH.
    use `go env GOPATH` get GOPATH envirment variable.

  daily build update
    update vitess vendor package
    update document about installation and configration