SvyatoslavPozhydaev

fix scrolling back to top when at bottom because of NaN bug fixed manual scroll down add animation speed from option for manual scroll --- This change is [](https://reviewable.io/reviews/d4nyll/smartscroll/42)

fix identify for calculated format

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fix #859

Icorrect identify info for calculated format "%@"

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If use calculated format for indentify, them return wrong result. For example for PNG image 750x750 and with alpha chanel, always returned size width and height equal zero 0x0+750+750. I...