BATCH_SIZE_FACTOR: affects uncompressed batch size, default: 1.5
S3_CLOUDTRAIL_LOG_PATTERN: regex pattern to match CloudTrail log file, default: .CloudTrail..json.gz$
S3_IGNORE_PATTERN: regex pattern to match log file to be ignored/skipped, default: $^
Fix #32
Fix #35
Support batch send for CloudTrail log