BUGFIX: SHKTumblr default sharing options improved and fixed, so that user spends least possible time editing the post.
NEW FEATURE: added URL sharing to SHKTumblr
REFACTORING: minor send method code reduplication and cleanup
REFACTORING: SHKItem uses modern Objective-C syntax
NEW FEATURE: Tumbler can share image (both SHKShareTypeImage and SHKShareTypeFile). If you use SHKShareTypeFile metadata are preserved.