add license
Merge pull request #485 from wenshao/master

add license
modify version
Merge pull request #487 from cutedemons/master

modify version
change version to 1.0.2
Merge pull request #489 from wenshao/master

change version to 1.0.2
bug fixed for oracle connection checker
Merge branch 'master' of https://github.com/wenshao/druid
Merge pull request #490 from wenshao/master

修正OracleValidConnectionChecker的bug