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
Merge pull request #35 from avibryant/deprecated-mr2

Hadoop 2 compatible DeprecatedParquetInputFormat