Parquet, Hadoop-BAM integration, Hadoop 1/2 support

o ADAM now generates Avro records and stores them in Parquet files.
o Conversion from genomic file formats to Avro is now done using
  Hadoop Map-Reduce (instead of only local)
o ADAM now runs with any version of Hadoop
o Support for FASTA files has been added
o Cleaned up the way Avro generate source is handled
o Added optional BAM attributes to ADAM format