Fix bug with pageflip transition
Fix bug with pageflip transition

vdclouis/viewer.js,lakenen/viewer.js,denodster/viewer.js,vdclouis/viewer.js,box/viewer.js,denodster/viewer.js,box/viewer.js,denodster/viewer.js,lakenen/viewer.js,lakenen/viewer.js,vdclouis/viewer.js,box/viewer.js