Multiple Input File Support

The --file switch also supports --files.  The --output strategy had to change to accomodate multiple inputs.  The switch was changed to --reportDir (but any subword like --report will work).  If this switch is present, an output report is generated and placed under the given directory.  The README file was also updated with some new examples.

   author:   John Colosi (jcolosi@verisign.com)
 modified:   README.md
 modified:   idn-properties