Skip whitespace in sample description file.
Skip whitespace in sample description file.

Thanks to @mikecroucher and @ssamberkar for spotting the issue.

Partially addresses mikecroucher/bcbio_examples#1.

brainstorm/bcbio-nextgen,a113n/bcbio-nextgen,a113n/bcbio-nextgen,a113n/bcbio-nextgen,mjafin/bcbio-nextgen,lbeltrame/bcbio-nextgen,brainstorm/bcbio-nextgen,mjafin/bcbio-nextgen,chapmanb/bcbio-nextgen,Cyberbio-Lab/bcbio-nextgen,Cyberbio-Lab/bcbio-nextgen,vladsaveliev/bcbio-nextgen,gifford-lab/bcbio-nextgen,lbeltrame/bcbio-nextgen,Cyberbio-Lab/bcbio-nextgen,gifford-lab/bcbio-nextgen,brainstorm/bcbio-nextgen,chapmanb/bcbio-nextgen,lbeltrame/bcbio-nextgen,biocyberman/bcbio-nextgen,gifford-lab/bcbio-nextgen,chapmanb/bcbio-nextgen,biocyberman/bcbio-nextgen,mjafin/bcbio-nextgen,vladsaveliev/bcbio-nextgen,biocyberman/bcbio-nextgen,vladsaveliev/bcbio-nextgen