Let us add more files after initial file creation

[septIO]

Currently you can set up you app, and then that's it. If we want to later make more models we'll have to add in the same sketch we used back then, make changes to the Schema and then to the templates (if any).

I want this to be possible (I'll check off items as they're implemented):

• Add models whenever i want
• Add functionality to already build files, eg. add phonenumber to users
• Load in the sketch / schema i used to make my current app (including edits from step 2)

[septIO]

If your app is a git repo, you can get around the "Deletes files when adding new models" by doing this:

1. Make sure your latest changes has been commited
2. Add a new model
3. Run git stash to "remove local changes"
4. See that all of your old files are back, and the new files generated from the model stays