Add PSGI Streaming - Updated#8

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miketonks wants to merge 5 commits intomarkstos:masterfrom

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Commits on Mar 9, 2013

Refactored run method to return just $body for callback, updated relevant tests
mike
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tabs > spaces
mike
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close writer (pod)
mike
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pod: use _send_psgi_headers
mike
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Commits on Mar 26, 2013

make send_psgi_headers method public, we we can use it in streaming callback
mike
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