Merge branch 'develop' of https://github.com/biowdl/tasks into BIOWDL-371

CHANGELOG.md

CPAT.wdl

bedtools.wdl

biowdl.wdl

bowtie.wdl

bwa.wdl

collect-columns.wdl

common.wdl

cutadapt.wdl

fastqc.wdl

fastqsplitter.wdl

gatk.wdl

gffcompare.wdl

hisat2.wdl

htseq.wdl

minimap2.wdl

picard.wdl

requirements-test.txt

samtools.wdl

seqtk.wdl