Release 0.7.4

PR's included in this release:
https://github.com/WebFilings/wf-uicomponents/pull/39

How To +1/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_0.7.4
$ ./init.sh
$ grunt qa
```

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