Add bufferShouldShortenURLS option
Add link shortening methods before presentation of the Buffer Sheet
Add requiresShortenedURL, also add ability to turn off Buffer Sheet shortening via config.
Update SDK to 1.1.3

Adds support for disabling link shortening.
Also resolves some issues with link shortening accessing the UI from another thread.
Update Buffer SDK to 1.1.4

- Updated handleOpenURL to return BOOL.
- Resolved issue with resources bundle path when not set, won't effect ShareKit as this is set within SHKBuffer.
Call shortenURL rather than bufferShortenURL (now removed)
Add comment for bufferShouldShortenURLS
Fetch config for requiresShortenedURL
Change performSelector to just [self shortenURL]
Define shortenURL method in SHKSharer.h
Update submodule to latest version
Merge pull request #742 from ay8s/master

Added ShareKit link shortening.