Use interfaces from dojo cli

[umaar]

Type: feature

The following has been addressed in the PR:

• [x] There is a related issue
• [x] All code matches the style guide
• [x] Unit or Functional tests are included in the PR

Description:

Uses the interfaces from dojo/cli instead of dojo/interfaces.

Addresses: https://github.com/dojo/meta/issues/223

[tomdye]

Superseded by https://github.com/dojo/cli-build-webpack/pull/266