REFACTORING: PKMultipartInputStream included as git submodule
NEW FEATURE: Added file upload for Plurk. Also image upload shows progress for Plurk.
NEW FEATURE: SHKTumblr can report file share progress, support NSInputStream if path is provided + shareForm enhancements
NEW FEATURE: SHKiOSTwitter reports upload progress.
NEW FEATURE: SHKiOSFacebook can report progress with video uploads. Also if item hasPath, it is streamed instead read into memory