Fixed #272 : I need an new option( onpreloaderror ) to see if it fail…#273

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zemzheng wants to merge 1 commit intotuupola:masterfrom zemzheng:master

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Commits on Jul 20, 2015

Fixed tuupola#272 : I need an new option( onpreloaderror ) to see if it fail to load the image
zemzheng
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