Add Brotli compression to Parquet

Hi,

Google release a new compression algorithm called Brotli.
A new compression algorithm for the internet, as they claim.
Currently Firefox and Chrome (both developer editions) already
support Brotli, as such as e.g. ngingx.
http://google-opensource.blogspot.de/2015/09/introducing-brotli-new-compression.html

I'm the author of jbrotli - the Java bindings for brotli.

I'm curios and doing a survey, if jBrotli is an option for parquet?
Feedback is welcome.

Thanks in advance
Martin

**Environment**: all
**Reporter**: [Martin W. Kirst](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=marki)
**Assignee**: [Ryan Blue](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=rdblue) / @rdblue
#### Related issues:
- [Add Brotli compression to Parquet format](https://github.com/apache/parquet-format/issues/267) (is blocked by)
- [Add Brotli compression codec](https://issues.apache.org/jira/browse/HADOOP-13126) (is related to)
#### PRs and other links:
- [PR #344](https://github.com/apache/parquet-mr/pull/344)

_{**Note**: *This issue was originally created as [PARQUET-521](https://issues.apache.org/jira/browse/PARQUET-521). Please see the [migration documentation](https://issues.apache.org/jira/browse/PARQUET-2502) for further details.*}

まず、リンクされているparquet-formatのissue #267とHadoopのissue HADOOP-13126を読み、その後、既存の作業についてPR #344を確認してください。このissueではファイルやテストが指定されておらず、jBrotliが適しているかどうかについてのフィードバックを求めているため、完了にはスコープの確定と実装方針の合意が必要です。

索引モデルが issue の本文から書いたものです。