2020-07: ver. 37.2

* Updates to Dockerfile template
* Support for newest export formats
* Bug fixes.

2020-05: ver. 37.0

* Package created. Using 37 as original version
* Added support for API key permissions in app.json using permissions file.
* Added support for new apphost config section.
* Customization and config properties files now extracted from setup.py.
* Rename 'app:package' command to 'package'.
* Bug fixes.

2020-04: ver. 36.2.dev

* Package dev version created. Using 36.2 as original version
* Added support for API key permissions in app.json using permissions file.
* Added support for new apphost config section.
* Customization and config properties files now extracted from setup.py.
* Rename 'app:package' command to 'package'.
* Bug fixes.

2020-04. ver. 0.0
