Release wf-uicomponents 0.8.4

PRs contained in this release:

https://github.com/WebFilings/wf-uicomponents/pull/81
https://github.com/WebFilings/wf-uicomponents/pull/82
https://github.com/WebFilings/wf-uicomponents/pull/63

Diff Between Last Tag and Proposed Release: https://github.com/Webfilings/wf-uicomponents/compare/0.8.3...Release_0.8.4

How To +10/QA
-------------

```bash
# skip the following steps if you've already initialized the project
git clone git@github.com:WebFilings/wf-uicomponents.git
cd wf-uicomponents

# do not skip these!
git fetch && git checkout Release_0.8.4
Run unit tests
```