Removed third-party theming systems from the project.

[wendigolabs]

No description provided.

[mdespuits]

🍔🌹

[wendigolabs]

Ahhh, I just noticed that Grid.test.js is still referencing theming, so I need to fix that. Kinda seems like that test should've failed? But then again there's a test farther down that seems to bless passing an unparsed gutter value through:

  describe('with garbage string in `gutter` prop', () => {
    it('renders', () => {
      mount(<Grid gutter="garbage-string" />);
    });
  });

?