make MapReduceInputFormatWrapper#RecordReaderWrapper support MapredInputFormatCompatible
a CombinedSequenceFile cascading scheme that works with the EB split combiner
added test for CombineSequenceFile to check hadoop confs are set correctly
added javadoc header to CombinedSequenceFile
Merge pull request #417 from amatsukawa/cascading_seqfile_combine

A Cascading scheme for combining intermediate sequence files