Added the ability to stream results from the bulk API. #530
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I have been using simple-salesforce to pull information from our very large SFDC instance. I discovered that the bulk API implementation can allocate large amounts of memory when pulling extremely large result sets.
This commit provides the ability to stream results from the bulk api, which keeps the memory footprint low.
I have provided two mechanisms for streaming from the bulk API, one is streamed JSON, which uses the json-stream library, and the other is streamed plain text.