Fix Podspec 

I"ve got it working It needed the preserve_path which you had already done it needed to have library in the path which again you had already done . I changed the Frame_work_search_path to match the correct path . I have run and tested it on my private pod repo and got a mate to do the same and its 100% working once running pod install you can import the <FPPicker/FPPicker.h> file and use the framework