Completion callback improvements#67

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virl wants to merge 6 commits intoromaonthego:masterfrom

Commits on Nov 8, 2013

Add completion handler compatible with UIActivityViewControllerCompletionHandler to the activityViewController, which return the selected activity type.
huguesbr
committed

Commits on Nov 15, 2013

Fix crash coming back from safari
huguesbr
committed

Commits on Mar 6, 2014

Sharing completion block called with success only upon real sharing completion (when content is really posted to social network).
virl
committed
Merge pull request #1 from virl/master
huguesbr
committed

Commits on Jul 11, 2014