Changed type of image to id so that BisKit works in iOS and MacOS

SVN: 27180

openbis-ipad/BisKit/Classes/CISDOBIpadEntity.h

@@ -45,8 +45,8 @@
 @property (nonatomic, retain) NSString * propertiesJson;
 @property (readonly)          NSArray * properties;
 
-///! The image contained at the imageUrl or nil if there is no image.
-@property (nonatomic, strong) UIImage * image;
+///! The image contained at the imageUrl or nil if there is no image. Could be a UIImage or CIImage depending on the platform.
+@property (nonatomic, strong) id image;
 
 // Actions
 //! Take the values from the raw entity.