Kdodia/slugify 2

~~This is a cleaner change than moving everything to `project_endpoint`, as before. "Exposed" names are available under the attribute `pretty_name`, although they will usually only be referenced in templates or `flash() `messages.~~

Changed the convention to keep `project.name` as the primary view, and slugify the name into the `project.slug` attribute.

Requires a db migration (check the drive for latest `app.db`).

Closes #73.