sjn update to give option to build with ref data

#---------------------- b27 reference genomes -----------------------------
# HASH this out if you want to include reference data files indexed for novoalign, bwa, stampy and bowtie2
# WARFNING: Lagre File
# OPtion is to mouint this
# docker run -v /*host*/reference_data/:/usr/local/pipeline/reference_data

# ADD reference_data.tar.gz /usr/local/pipeline/ \
# && chown -R pipeman:ngsgroup /usr/local/pipeline/reference_data