Implement templating system

I'm interested in creating a template system. When you create a project you can start with an existing library of your own or we will generate one for you. It might be useful to have a small library of starter templates that demonstrate common techniques when using dshell.

dshell create from <template>

Templates would live in ~/.dshell/templates

Then give the user the ability to list, add and delete templates of their own.

We should have two subdirectories under templates:

• builtin
• user
  This will allow us to upgrade the builtin templates without risk of interfering with the user templates.

Should we allow a user to create a template with the same name as a builtin template?

We should could allow a user to create a template with the same name as a built in template as a way to 'override' the standard templates.

If this is the case then we should warn the user before creating the user template.