BUG FIX: fix for #710 - public uploads

Public sharing on YouTube sharer was not working because even though the
UI showed "public" as the default setting, it was not actually set
Merge pull request #717 from PUDRESCU/master

BUG FIX: Issue #710 Public share on YouTube sharer
SHKBuffer
Add Buffer to handleOpenURL
Buffer SHKConfigurator config added
Add example Buffer URL Scheme
Add SHKBuffer to Sharers
Add Buffer iOS SDK Framework Submodule
Update modules
Project file updates adding Buffer to ShareKit
Make Facebook sharing behaviour of a text item with an url consistent between iOS 5 (FB sdk) and iOS 6 (native).
Add Buffer API Configuration from SHKConfig
Update project to use embedded framework with resources. May be a better way to include these.
Update SHKTwitter.m

When using the twitter forcePreIOS5TwitterAccess:true, the URL and Hashtags get double filled because prepareItem is called before and after authorization.
added Buffer credentials for the demo app
SUBMODULE UPDATE: Buffer
Merge pull request #724 from markverkiel/patch-1

Double fill hashtags and URL at first authentication
Merge pull request #722 from SergioEstevao/master

Make Facebook sharing behaviour of a text item with an url consistent between iOS 5 (FB sdk) and iOS 6 (native).
REFACTORING: simplified SHKFacebook
NEW FEATURE: SHKMail made more universal (issue #704) + property support matrix update