PARQUET-1262: Use the same BOOST_ROOT and Boost_NAMESPACE for Thrift
PARQUET-1262: Use the same BOOST_ROOT and Boost_NAMESPACE for Thrift

Author: Korn, Uwe <Uwe.Korn@blue-yonder.com>

Closes #460 from xhochy/PARQUET-1262 and squashes the following commits:

2a886ce [Korn, Uwe] PARQUET-1262: Use the same BOOST_ROOT and Boost_NAMESPACE for Thrift

majetideepak/parquet-cpp,wesm/parquet-cpp,apache/parquet-cpp,wesm/parquet-cpp,apache/parquet-cpp,apache/parquet-cpp,majetideepak/parquet-cpp,apache/parquet-cpp,wesm/parquet-cpp,majetideepak/parquet-cpp,majetideepak/parquet-cpp,majetideepak/parquet-cpp,apache/parquet-cpp,wesm/parquet-cpp,apache/parquet-cpp,wesm/parquet-cpp,wesm/parquet-cpp,majetideepak/parquet-cpp