code: public String compile(final InputStream stream,
                            final String worksheetName) {
          return compile( ResourceFactory.newInputStreamResource( stream ), worksheetName );
      }
docs: Looks for a named worksheet to find the decision tables on. Only works
  with XLS format spreadsheets (as they have multiple worksheets).
  
  @param stream
  The stream of the decision tables (spreadsheet) IN XLS format !!
  @param worksheetName
  The name of the worksheet that the decision tables live on.
  @return DRL, ready to go.