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
Make Facebook sharing behaviour of a text item with an url consistent between iOS 5 (FB sdk) and iOS 6 (native).
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
SUBMODULE UPDATE: Buffer iOS sdk
Merge branch 'AY8smaster'
REFACTORING: SHKBuffer now uses send method instead of show + SHKSharer cleanup