Keep field ids in Parquet Schema

https://github.com/apache/parquet-mr/pull/56
This pull request adds the field ids from Thrift and Protos in the Parquet schema. The goal is to simplify implementation of backward compatibility features when using those.

**Reporter**: [Julien Le Dem](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=julienledem) / @julienledem
**Assignee**: [Julien Le Dem](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=julienledem) / @julienledem

_{**Note**: *This issue was originally created as [PARQUET-90](https://issues.apache.org/jira/browse/PARQUET-90). Please see the [migration documentation](https://issues.apache.org/jira/browse/PARQUET-2502) for further details.*}