support allow-collates checks

  go test ./... -update

  ref: https://github.com/XiaoMi/soar/pull/147

  Thanks @xiyangxixian

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

fix #141

fix #89 

fix index advisor give wrong database name, `optimizer_xx` is tempora…

  FULLTEXT INDEX suggestion

update RuleMultiDeleteUpdate content & summary

make RuleForbiddenSyntax more compatible with other companies

  insert values count large than -max-value-count will give ARG.012

  When set log to console, if fmt.Print larger than 1K
  the output buffer will be truncate. This problem will be
  trigger when set log to stdout, beego and soar both print their
  output into stdout, and this may come into confusing status in
  mac os.

  For fixing this problem, we only allow set log to file not.
  SOAR never write SQL suggest into log. Only developer should be
  concern about log, common user have no need of looking up log.

  single line comment in sql will merge next line into before one.

  RemoveSQLComment trim space

  trimspace before check single line comment

fix TestFindAllCols, add expression type

  tidb parser now is much more reliable
  change only-syntax-check totally into tidb parser.

  SplitStatement check if single comment line is in multi-line sql.

  pure comment line should break quickly, single comment in multi-line
  sql should wait for line delimiter

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