replacing wget with curl.
grouping code logicially.
cleaner use of sed.
Store original timestamps for NCBI's Gene for archival purposes.
NCBI's Gene database is potentially updated daily; see
http://www.ncbi.nlm.nih.gov/books/NBK3841/#EntrezGene.How_Data_Are_Maintained
save NCBI Gene files with original timestamp in name for archiving.
get uniprot release name and rename files appropriately.
adding note about downstream tools.
adding version information to downloaded NCBI Gene and Uniprot databases.
merging branch 'feature/updating-reference-downloads' into develop.
Merge branch 'develop' of https://github.com/cancerregulome/gidget into develop