Use expected config object when creating app

### Purpose
Properly use the `config_object` parameter inside of `create_app`.

### Description
Since we determine config object in all entry points, we should properly use the object within the creation function instead of rebuilding this object path.  The noted entry points are located:
* `{{cookiecutter.repo_name}}/manage.py`
* `{{cookiecutter.repo_name}}/{{cookiecutter.repo_name}}/app.py`
* `{{cookiecutter.repo_name}}/{{cookiecutter.repo_name}}/main.py`
* `{{cookiecutter.repo_name}}/{{cookiecutter.repo_name}}/tests/unit_tests.py`