for #46 added download retry control options

for #46 added download retry control options
minor typo for #46

minor typo for #46
for #46 new download-retries options

for #46 new download-retries options
updates for #46

updates for #46
#46

#46
#46

#46
max read-retries  for #46

max read-retries  for #46
for #46 updated readme

for #46 updated readme
updated doc for #46 read retries

updated doc for #46 read retries
Merge pull request #47 from ewah/master

options for issue #46 (read/download retries)