dropSamplesFromReport.py Argument Handling Error

Arguments are passed to dropSamplesFromReport.py through sys.argv:

``` python
report = sys.argv[1]
dropSamples = sys.argv[2]
```

However, next section expects use of the usual OptionParser approach used in the other scripts:

``` python
if options.report.find(".gz") != -1:
    file = gzip.open(options.report)
else:
    file = open(options.report,'r')
```
