fix bug #258 enable 4 orientation

This problem is :  when rotate iPad or mini to a portrait  upside down orientation ,  videoplayback orientation won't change and remain in the previous one ( Landscape left or right). 

read Apple document, by default the Apple human interface guidelines suggest that iPhone apps should not be rotated upside-down.  
I enabled to support 4 orientation and tested it in both iPad and mini. It works very well. 
Cna some one test it in iPhone ?