Makes ExAws.request methods call and handle the result.

Return nil if error, otherwise return AWS response.

Example - Verification if a file was successfully uploaded to AWS S3

config = Keyword.put([],     :bucket_name,        "aws S3 bucket name")
config = Keyword.put(config, :bucket_url,         "aws S3 bucket url")
config = Keyword.put(config, :version,           "aws S3 bucket version")
config = Keyword.put(config, :access_key_id,     "aws S3 bucket access key id")
config = Keyword.put(config, :secret_access_key, "aws S3 bucket access key")
config = Keyword.put(config, :region,            "aws S3 bucket region")
uploaded_file = ExAws.S3.put_object(bucket_name,file_dir,binary,[acl: :public_read])  
file = Krug.AWSUtil.make_aws_request(uploaded_file,config)
(nil != file and file)