Merge branch 'master' of https://github.com/alibaba/druid

Merge pull request alibaba#372 from wenshao/master

add testcase & remove unused code

Merge pull request alibaba#347 from wenshao/master

0.2.20

add benchmark test

Merge pull request alibaba#328 from wenshao/master

0.2.7

Merge pull request alibaba#300 from wenshao/master

improve WallFilter

Merge pull request alibaba#282 from wenshao/master

0.2.15

Merge pull request alibaba#281 from wenshao/master

0.2.14