Implement styled-components.

[AriTheElk]

Currently this is not feasible until styled-components/styled-components#152 is merged, but after that's complete and we've upgraded all dependencies (#26) we should be able to implement styled-components no problem.

Advantages of implementing styled-components:

• Styles will be editable inline with the TypeScript code. Reducing the total file clutter in the codebase and also enabling developers to quickly locate and modify the CSS related to the current component.
• Theming will be an absolute breeze. We'll be able to store theme data in json files and then load the required values inside the styled templates.

[AriTheElk]

It looks like there's been a lot of progress on the PR to bring TypeScript support to styled-components. Once I clear up some time on my schedule, I'm going to begin working on #26 if @mmarkman hasn't made any progress on it by then; so that we're prepared for styled-components support when it's released 👌