Merge pull request #534 from forumbyr/master

refactor.
remove unused jars.
Merge pull request #536 from forumbyr/master

remove unused jars.
Merge pull request #537 from forumbyr/master

remove commons-logging exclude jars.
Merge pull request #538 from forumbyr/master

add comment.
Merge pull request #34 from cnnic/dev

merge from cnnic