Fix return none.
Merge pull request #12 from xutao/scanner:fix

Fix return none.
Merge branch 'master' of http://code.dapps.douban.com/lijunpeng/scanner
Merge pull request #5 from cuteio/hotfix

Hotfix python 2.7.3
Bump to v0.0.4
Merge pull request #6 from cuteio/hotfix

Bump to v0.0.4