REFACTORING: removed all [[SHKActivityIndicator currentIndicator] hide]; direct calls from sharers. It is a duty of delegate to handle UI, created new delegate method for this + minor cleanup
REFACTORING: removed all direct [[SHKActivityIndicator currentIndicator] displayActivity:] calls, instead redirected to shareDelegate
BUGFIX: SHKFoursquare added CLLocationManager delegate method (the original is deprecated)
REFACTORING: removed all remaining SHKActivityIndicator direct calls, redirected to delegate. Decoupled SHKActivityIndicator, you can supply your own SHKActivityIndicator subclass