Creating a project with kabob-case causes errors #4
Description
When using mix phoenix.new some-kabob-case, you'll get this error:
** (Mix) Application name must start with a letter and have only lowercase letters, numbers and underscore, got: "some-kabob-case". The application name is inferred from the path, if you'd like to explicitly name the application then use the `--app APP` option.
With Firebird, it creates the project anyway, which then screws up the project.
We should implement the same protections as Phoenix's generator (or push this upstream if it's an upstream problem).