ThriftParquetReader and ThriftParquetWriter
change default page size and add some doc
Merge pull request #105 from Parquet/ThriftParquetWriter

ThriftParquetReader and ThriftParquetWriter
Merge branch 'master' of github.com:Parquet/parquet-mr into change_default_block_size
fix doc
Update README.md
[fix validation script] when boolean value is null, set it to 0 for being compatible.
Merge branch 'master' of https://github.com/Parquet/parquet-mr into fix_boolean_default_value_for_tuple_converter
Merge pull request #107 from Parquet/change_default_block_size

Change default block size and clarify some doc