Added a little method to get the basename of a file.
Added a little method to get the basename of a file.

annkupi/picard,nh13/picard,annkupi/picard,alecw/picard,nh13/picard,alecw/picard,annkupi/picard,nh13/picard,broadinstitute/picard,nh13/picard,broadinstitute/picard,broadinstitute/picard,broadinstitute/picard,broadinstitute/picard,alecw/picard,annkupi/picard,alecw/picard