Piexif

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- Bug fix: https://github.com/hMatoba/Piexif/issues/16

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- Fix APP1 matter.

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- Support SLong type.

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- Add some error detail to 'dump'.

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- Fix bug. 'load' and 'dump' InteroperabilityIFD was wrong.

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- Add handling InteroperabilityIFD, 1stIFD, and thumbnail image.
- *'load'* returns a dict that contains "0th", "Exif", "GPS", "Interop", "1st", and "thumbnail" keys.
- *'dump'* argument is changed from three dicts to a dict.
- *piexif.ZerothIFD* is renamed *piexif.ImageIFD* for 1stIFD support.