Develop (#46)

* improved exception message when no binary file is found

* no longer uses the `Folder` class

* updated

* fixed

* Develop dependencies (#42)

added tests for lower dependencies

* updated

* come back

* fixed

* fixed

* updated

* little fixes for `BackupManager` and `BackupExport` classes

* test

* fixed typo

* little fixes

* fixed

* updated

* fixed

* added badge

* some fixes

* uses `Filesystem` class

* come back

* fixed

* fixed tests

Author: mirko-pagliai