Exception object is missing getPrevious method

Exception object is missing getPrevious method which leads to whole $e object serialization. If stack trace has closures the following error occurs "Serialization of 'Closure' is not allowed" in hybridauth/Hybrid/Storage.php(54).
Merge pull request #132 from Telford-Rowley/master

Exception object is missing getPrevious method
Merge pull request #126 from maximerassi/master

Updated Providers\Facebook.php for getting cover photo.
If logfile does not exist - try to create it instead of throw exception. Trows exceptionon failure to create logfile.
Merge pull request #154 from pavlyuts/master

If logfile does not exist - try to create it instead of throw exception....
Merge commit 'bc03048decb460249456ade44a6b3840a24c5f26'