PARQUET-72: Update POM to use ASF parent.

Adds the org.apache:apache POM as the parent, which sets up the standard
Apache release configuration, including repositories,
distributionManagement, and a release profile. The existing Sonatype
release info has been removed.

Updates version to include "incubating", required for release by
Incubator policy.

Removes settings that are supplied by the parent, like encoding
properties and plugin versions. Overrides parent settings for compiler
source and target versions. Updates scm links.

Adds info for mailing lists and issue tracker.