Merge pull request #821 from tkach/master

SHKFacebook error alerts presentation logic is fixed according to Facebook iOS SDK
BUGFIX: do not show no accounts alert when sharer.quiet is YES
REFACTORING: slightly simplified SHKFormOptionController and SHKFormFieldLargeTextSettings initialisers
Refactoring: SHKXMLResponseParser now creates proper NSDictionary with nested objects. Preserves original xml structure. Before it flattened the structure to contain all (even nested) elements in the root
BUGFIX: cancel on oauth authentication view always fired auth view again
NEW FEATURE: linked in can fetch user info
DOCUMENTATION UPDATE: support matrix
added what's new wiki info + SHKItem.h link
NEW FEATURE: SHKFlickr can share file - thus preserves exif info. Got rid of ObjectiveFlickr dependency.
Removed ObjectiveFlickr dependency.
Merge branch 'master' into flickrSimpleOAuthSharer
BUGFIX: removed empty Flickr SDK target. It is no longer needed - objectiveFlickr dependency has been removed. Fixes #824.
Update README.md
NEW FEATURE: Flickr supports video
Merge branch 'master' of github.com:ShareKit/ShareKit
NEW FEATURE: Enhanced URL share. Allows to explicitly set URL Description and URL Picture. Sharers currently supporting this are Facebook and LinkedIn. Deprecated facebookURLSharePictureURI and facebookURLShareDescription.