If DEXSeq is not found, don't make the DEXseq reference file.
Merge branch 'master' of github.com:chapmanb/cloudbiolinux
Move to samtools 1.0, support brew version checking on devel versions
Merge branch 'master' into nmdp-ngs-pipeline
Merge branch 'nmdp-ngs-pipeline' of https://github.com/heuermh/cloudbiolinux into nmdp-ngs-pipeline