bugfix of mysql parser for #comment
Merge pull request #630 from wenshao/master

add testcase
Merge pull request #631 from wenshao/master

bug fixed for fatal exception & async close
Merge pull request #632 from wenshao/master

async close support
Merge remote-tracking branch 'upstream/master'
Merge pull request #633 from yakolee/master

bugfix of mysql parser for #comment
improve sqlwall for mysql hints
Merge pull request #634 from yakolee/master

improve sqlwall for mysql hints
improve sqlwall
Merge pull request #635 from yakolee/master

improve sqlwall
improve sqlwall
Merge pull request #636 from yakolee/master

improve sqlwall
improve sqlwall: 'hints' and 'start transaction'
improve sqlwall: union
Merge pull request #638 from yakolee/master

improve sqlwall
improve sqlwall: update
Merge pull request #640 from yakolee/master

improve sqlwall: update
Revert "improve sqlwall: update"
Merge pull request #641 from zhihang777/revert-640-master

Revert "improve sqlwall: update"
Revert "Revert "improve sqlwall: update""