1. retry logic when inline = true and server returns 449. retry is with exponential backoff with backoff multiplier as 2 and initial delay of 20 secs. Max 4 retries are done.
2. When inline = False, added check for eventual consistency before downloading data. If complete data is not available then raise exception
bug fix.
message should be logged to log object.
Merge pull request #14 from guptarajat/master

449 status handling in get_results and retry logic in get_results for eventual consistency of s3