Add material design theme for tab (#83)

[jellison]

Type: feature

The following has been addressed in the PR:

• [x] There is a related issue
• [x] All code has been formatted with prettier as per the readme code style guidelines
• [ ] Unit or Functional tests are included in the PR

Description: Material design theme for tab controller & tabs. Supports all existing tab controller alignments. Relies on new markup/classes introduced in dojo/widgets#894

Resolves #83