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.

(cherry picked from commit 678dec6680f06c2f2a5969fb608ecfdc69981b93)
Signed-off-by: Reynold Xin <rxin@apache.org>