Investigate if addon blueprints can be removed.

[mriska]

The blueprints for addons:

• addon-import
• component-addon
• helper-addon
• initializer-addon
• route-addon

are now basically similar to the default ember blueprints. Check if it is possible to remove them from this addon completely.

@kimroen:

These files are now more or less identical to what the default ember -addon blueprints do. Can we remove them from ember-cli-coffeescript and still have them work?

I don't think we have tests for that, so we need to add a test for the addon-version of all the components that have addon-variants. Is that something you have the time to look into?