解决PagerUtils.limit 不支持PostgreSQL的bug

参考MySQL的Limit实现，增加PGLimit实现PagerUtils.limit 支持生成PostgreSQL的分页查询sql语句
Merge pull request #649 from lizongbo/master

解决PagerUtils.limit 不支持PostgreSQL的bug
fixed compile error
change version to 1.0.10
Merge pull request #650 from wenshao/master

fxied compile error & change version
improve mysql createTable parser
add testcase
Merge pull request #651 from wenshao/master

improve mysql createTable parser