benchmarks added to filewriter_test, demonstrate buffered version is ~5x faster on my hardware. Signed-off-by: David Lawrence <david.lawrence@docker.com> (github: endophage)  | 
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							benchmarks added to filewriter_test, demonstrate buffered version is ~5x faster on my hardware. Signed-off-by: David Lawrence <david.lawrence@docker.com> (github: endophage)  | 
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| docs | ||