kejinlu/PagedFlowView — pull request #16 by shede333 (2014-08-28 12:01:29+00:00)
Title: fix:pageIndex or _currentPageIndex may be negative value

当你在第一页时 继续往右(horizontal)拉扯时，pageIndex or _currentPageIndex 就有可能是负值，负值不是应该出现的值