[1.0] `startapp` compatibility changes

- Removed all `$$$$..$$$$` variables and replaced with with `{{..}}`
- Removed the same thing for file names and used `app_name` in its place
[1.0] More `startapp` compatibilty fixes
[1.0] Fixed up the `start_app` script

- Made the script utilize the `{{..}}` strcture that django `startapp` command uses
- Cleaified the inputs that may have been misleading
    - you are creating a `package` i.e. `django-package`
    - inside the package there is an app i.e. `package`