add. settings vars for flask app server instance.
fix. break larger responses into pieces that can be sequentially pulled off of the queue.  Otherwise the queue blocks indefinitely.
add/mod. response_handler module.  This will handle pulling pending jobs off of the queue and setting putting them in the cache.
mod. response handler / request manager communication.
add. callback handler in request_meta to track actvity of requests.
add. wrap request activity communication in methods.
mv. methods for traversing dictionary nested keys to utils.
mod. set_data and get_data read and write data to a file using pickle.
mod. import logger, pep8.
mod. added some items.
mod. move request_notification callback to request_manager module.  Make loggin more readable.
add. locks to requests notification queue wrapper methods to enforce atomicity.
fix. get_data refs to pickle data.
fix. returning results when data fits in one chunk.
mod. moved MAX_CONCURRENT_JOBS and QUEUE_WAIT constants to request_manager  module
add. utility method salt_string for generating secure hashes.
Merge pull request #12 from rfaulkner/master

request_manager handling larger responses / request notifications listener