Merge pull request #18 from 942v/master

Added FXPageControl and pagecontrol subclass
Update README.md
Fixed orientation button image in demo project.
Update README.md
Update GBInfiniteScrollView.podspec
Update GBInfiniteScrollView.podspec
Update GBInfiniteScrollView.podspec
Update GBInfiniteScrollView.podspec
Fix the button error for GBInfiniteViewControllersDemo
Fix the tableView inset bug.
Fix the enumerateObjectsUsingBlock bug from iOS6
Fix the tableView insets bug from iOS6.

but the iOS6 view frame is error, origin y is 20.
This demo can not see refresh view on screen.
Refs issue #22, set pages number when reloadData
Merge pull request #23 from KyleXie/issue-22

Refs issue #22, set pages number when reloadData
Merge pull request #19 from xhzengAIB/master

Fix the button error for GBInfiniteViewControllersDemo
Add a delegate method to track the tap gesture
Merge pull request #24 from KyleXie/issue-1-tap-gesture

Add a delegate method to track the tap gesture
Add new protocol methods

- (BOOL)infiniteScrollViewShouldScrollPreviousPage:(GBInfiniteScrollView *)infiniteScrollView;
- (BOOL)infiniteScrollViewShouldScrollPreviousPage:(GBInfiniteScrollView *)infiniteScrollView;
- (void)scrollToPageAtIndex:(NSUInteger)index animated:(BOOL)animated;
Add new protocol methods
- (BOOL)infiniteScrollViewShouldScrollPreviousPage:(GBInfiniteScrollView *)infiniteScrollView;
- (BOOL)infiniteScrollViewShouldScrollPreviousPage:(GBInfiniteScrollView *)infiniteScrollView;
- (void)scrollToPageAtIndex:(NSUInteger)index animated:(BOOL)animated;