Toggle: theme is now injectable.

[dzearing]

Description of changes

When rendering Toggle components, they now respect injectable themes.

This can mean the default theme using the loadTheme helper:

import { loadTheme } from 'office-ui-fabric-react/lib/Styling';

loadTheme({{ palette: { themePrimary: 'green' }});

Or injected using the Customizer:

let greenTheme = createTheme({ palette: { themePrimary: 'green' }});

return (
  <Customizer settings={{ theme: greenTheme }}>
    <Toggle/>
  </Customizer>
);