Merge pull request #459 from cutedemons/master

improve sqlwall rule
Merge pull request #460 from cutedemons/master

fix blacklist bug & parameterize NULL to ?
Merge pull request #461 from cutedemons/master

modify testcase
improve parameterize sql
support interval alias
pom version change to druid-0.2.27
change gpg.skip
fixed typo
sqlwall add partAlwayFalse rule