Made a few quality/fastq conversion methods public.
Made a few quality/fastq conversion methods public.

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