v2.1.3

Set API_VERSION as environment variable. This allows for change of API_VERSION without the need of republishing the app

Change to tree-type app

Due to memory management issues, the app is now changed to a tree-type app. Each uploaded PDF is its own entity. This greatly improved the stability of the app. In addition, it is now much easier to add or remove documents to an existing project.

Option to exclude pages added

Sometimes memory errors occured for PDFs containing large files. This release enables the user to identify and exclude these pages.