1. Normalize project structure in anticipation of move from ant to mvn.
2. Deprecated old ARCInputFormat code (moved from hadoop.io to
hadoop.io.deprecated
3. Added new Hadoop FileSystem based ARCInputFormat to hadoop.io package.
4. Added test cases to validate new ARCInputFormat code.
5. ARCInputFormat now returns a BytesWritable buffer as the value type.
   The buffer consists of the HTTP Headers (encoded as UTF-8), followed
   by a trailing CRLF (\r\n).Everything after the trailing CRLF is
   the raw content returned by the original HTTP request.