Extract image or pdf on windows platform bugfix#90

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eastxing wants to merge 4 commits intodocumentcloud:masterfrom

eastxing:master

Commits on Aug 14, 2013

Extract images on windows platform bugfix
eastxing
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Commits on Aug 15, 2013

Extract pdf on windows platform bugfix:
eastxing
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Commits on Aug 23, 2013

Only copy image files, skip other files such as Thumbs.db under windows platform when extract multi-sizes images.
eastxing
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Commits on Aug 26, 2013

windows platform path escape bugfix.
eastxing
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