Adding ngs-validate-interpretation tool

Notice the short command line arguments differ from the groovy script; i.e. observed is ```-b```

```bash
$ ngs-validate-interpretation -h
usage:
ngs-validate-interpretation -e expected.txt -b observed.txt [args]

arguments:
   -a, --about  display about message [optional]
   -h, --help  display help message [optional]
   -e, --expected-file [class java.io.File]  expected interpretation file [required]
   -b, --observed-file [class java.io.File]  observed interpretation file [required]
   -o, --output-file [class java.io.File]  output file, default stdout [optional]
   -r, --resolution [class java.lang.Integer]  resolution, must be in the range [1..4], default 2 [optional]
   -s, --summary  print summary [optional]
```