Merge pull request #262 from wenshao/master

add PagerUtils
Merge pull request #263 from wenshao/master

add PagerUtils
Merge pull request #264 from wenshao/master

add PagerUtils
Merge pull request #265 from wenshao/master

add PagerUtils oracle support
Update README
Merge remote-tracking branch 'upstream/master'
Merge branch 'master' of https://github.com/wenshao/druid