mod. add docs / pep8.
fix. ref to "<table>" rather than "<database>" in unformatted query.
mod. In requests_notification_callback renamed cache to job_list for clarity.
mod. move lock defintion to api package namespace and rename.
add. req_cb_flag_job_complete to handle setting job status to complete.
add. REQUEST_PATH constant.
fix. get_url_from_keys, parsing url path.
mod. move addition of job to job queue from view to when job is actually added to wait list in job_control.
Merge pull request #22 from rfaulkner/working

Modifications to Job Queue backend