PARQUET-23: Refactor parquet-format to org.apache names.

This updates parquet-format to use org.apache names. Still need to:
* Validate that parquet-mr works as expected when relying on these changes

Author: Ryan Blue <blue@apache.org>

Closes #18 from rdblue/PARQUET-23-rename-to-org-apache and squashes the following commits:

ddcd50e [Ryan Blue] PARQUET-23: Update changelog for org.apache parquet-format 2.2.0.
5c339d4 [Ryan Blue] PARQUET-23: Update POM to use Apache maven release config.
ac982ca [Ryan Blue] PARQUET-23: Refactor parquet-format to org.apache names.