Optimizations to page loading

* *Important* It is no longer necessary to call `reloadData` as part of your initialization process for SYPaginatorView - it is now called automatically when the SYPaginatorDataSource is set
* Less eager calling of `reloadData`
* Less eager loading of pageViews
Support vertical pagination

You can now have pagination occur via vertical swiping, by setting the `paginationDirection` property on `SYPaginatorView`
#5 fixing, calling paginatorView:willDisplayView:atIndex: method declared on delegate protocol
Update build settings for Xcode 4.5

Minimum iOS is now 4.3, build architectures are now standard (currently armv7 and armv7s)
Fix a bug that would cause the current page index to unexpectedly change during device rotation
Fix bug with French localization format string
Conditionally use weak properties if building with target SDK of iOS 5 or greater
Target iOS 5 (for weak property support)

Still compatible with iOS 4.3 by simply switching the deployment target, but won't build with weak properties
Use proper type in delegate