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Issue #172 - EXIF orientation support
Introduced ImageLoaderConfiguration.imageDecoder(...)
Introduced DisplayImageOptions.decodingOptions(...)
Made ImageDecoder as interface. Added BaseImageDecoder. Extract size and
scale calculation to ImageSizeUtils.
Sample: Increase min SDK to 5
Sample: Added test URL for EXIF image
Sample: Use ImageScaleType.EXACTLY for pager
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