make the API treat empty fields the same as missing fields to avoid confusion
turn on validation for generate TPCH
making empty fields illegal
replace DeprecatedContainerInputFormat with DeprecatedParquetInputFormat, should build under MR2
fix up cascading and scrooge to use DeprecatedParquetInputFormat
DeprecatedParquetInputFormat is not abstract
don't create a TaskAttemptContext in ParquetReader
Fixed potential Integer overflow.
+ needs space
Merge pull request #36 from 0xh3x/master

Potential Integer overflow in ColumnWriterImpl
Merge pull request #35 from avibryant/deprecated-mr2

Hadoop 2 compatible DeprecatedParquetInputFormat
Merge pull request #33 from Parquet/handle_empty_fields_as_nulls

make the API refuse empty fields and require missing fields