Updated CSS class names to match original repo#7

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NavjotPanesar wants to merge 2 commits intoandyshora:masterfrom

NavjotPanesar:master

Commits on Aug 31, 2015

The directive wasn't compatible with the custom animation css files from the original Wallop repo
NavjotPanesar
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Fixed next button class (accidently attached the previous button class)
NavjotPanesar
committed