Added Save To Camera Roll Activity.
OSKSaveToCameraRollActivity now uses OSKPhotoSharingContentItem content item and OSKShareableContentItemType_PhotoSharing content item type.
Fixed typo for iPad icon name.
Completion block is dispatched to the next runloop.
For devices that do not have a camera, changed the string to save to “Saved Photos” instead of “Camera Roll”.
Merge pull request #47 from kkarayannis/master

Added Save To Camera Roll Activity.