Update pom.xml to use version 13 of the ASF parent pom and add mailingLists element.
Bump up logging level to warning for failed tasks.
Merge pull request #58 from hsaputra/update-pom-asf

Update pom.xml to use version 13 of the ASF parent pom

Update pom.xml to use version 13 of the ASF parent pom.
Add mailingList element to pom.xml.
Merge pull request #59 from rxin/warning

Bump up logging level to warning for failed tasks.