Flexwrapp

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* When new documents are available for the flex worker, he will receive a push notification in flexwrapp, which indicates that new documents are available.
* Fixed an issue where the overview of documents was not updated properly after signing. Now the overview is properly updated with the current status of the documents.
* Fixed an issue where the app would hang on the splash screen in some cases. Now the app should either continue or ask to login again.