BUGFIX: iOS sharer native iOS UI can not fetch user info - now the sharer does not try to use SLComposeViewController for this.
BUGFIX: demo app accounts view now shows only sharers who can share, and require authorisation
DOCUMENTATION: updated sharer matrix
Merge branch 'master' of github.com:ShareKit/ShareKit
BUGFIX: Google+ now has authorisation methods working. You can authorise/deauthorize the user as in other sharers. Fixes #709
REFACTORING: Google+ uses native share dialogue instead of a trip to browser.

- removed GTL project. Files needed in Google+ and YouTube sharers are supplied via precompiled GoogleOpenSource.framework instead
- added GoogleOpenSource.framework to Frameworks
- added GooglePlus.bundle to Frameworks
NEW FEATURE: google+ image and video share