Release 0.1.13

PR's included in this release:
https://github.com/WebFilings/wf-common/pull/7


How To +10/QA
-------------

```bash
# skip the following steps if you've already initialized the project
$ git clone git@github.com:WebFilings/wf-common.git
$ cd wf-common

# do not skip these!
$ git fetch && git checkout release_0.1.13
$ ./init.sh
$ grunt qa
```