R (>= 2.15.2), digest, RCurl, httr, rjson, plyr, stringr
digest, RCurl, httr, rjson, plyr, stringr
digest, httr, rjson, plyr, stringr, base64enc
jsonlite (>= 0.9.5), httr (>= 0.3), plyr, base64enc, digest,
stringr