Use DownloadSingle in ctd
Use DownloadSingle for affymetrix
Use DownloadSingle in gene
Use DownloadSingle in hgnc
Use DownloadSingle in NDC - also fix undefined varable use
Use DownloadSingle in sgd
Use DownloadSingle in mgi
Use DownloadSingle for PharmGkb
Merge pull request #230 from amarillion/amarillion-002-downloadsingle-usage

Amarillion 002 downloadsingle usage