OSKActivity: Added -(void)prepareForDisposal and -(void)prepareForReuse optional methods (for freeing —reallocating— resources when a different activity is selected —cancelled— on the share sheet)
Improved OSKAccountAmangementViewController and related classes

1. Show only active account
2. Add authenticator for OSKFacebookSDKActiviry
Improved animated gif support. Added AnimatedGIFImageSerialization pod dependency
FacebookActivity improvements

1. Set visible name to "Facebook iOS" to differenciate from FacebookSDK
2. Add credential for FacebookSDK to ActivitiesManager and to info.plist
3. Add FacebookSDK to account manager
Updated podspec to 1.3.3-oe