ticket.40292, ticket.40637: InfiniteViewPager code refactoring and fix flash issue.
Code refatoring - InfiniteVIewPager
Modify example for InfiniteViewPager.
Fix that can't trigger onLoopPageSelected when scroll view.
Merge pull request #40 from KKBOX/dev_gigi

InfiniteViewPager - Code refactoring and modify examples.