Release wGulp 0.7.2

PRs contained in this release:

https://github.com/Workiva/wGulp/pull/85
https://github.com/Workiva/wGulp/pull/89
https://github.com/Workiva/wGulp/pull/92
https://github.com/Workiva/wGulp/pull/93
https://github.com/Workiva/wGulp/pull/94

Diff Between Last Tag and Proposed Release: https://github.com/Workiva/wGulp/compare/0.7.1...Release_0.7.2

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

```bash
# skip the following steps if you've already initialized the project
git clone git@github.com:Workiva/wGulp.git
cd wGulp

# do not skip these!
git fetch && git checkout Release_0.7.2
Run unit tests
```