Revert "add testcase"
improve sqlwall
revert wallconfig
Merge pull request #627 from yakolee/master

revert wallconfig spell
Merge pull request #625 from wyx0127/revert-622-master

Revert "add testcase"
bugfix of mysql parser for #comment
add testcase
change testcase
Merge pull request #630 from wenshao/master

add testcase
bug fixed for fatal exception & async close
Merge pull request #631 from wenshao/master

bug fixed for fatal exception & async close
async close support
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