Bump ember-cli-qunit from 4.0.1 to 4.4.0 (#280)

Bumps [ember-cli-qunit](https://github.com/ember-cli/ember-cli-qunit) from 4.0.1 to 4.4.0.
<details>
<summary>Changelog</summary>

*Sourced from [ember-cli-qunit's changelog](https://github.com/ember-cli/ember-cli-qunit/blob/master/CHANGELOG.md).*

> # Change Log
> 
> ## v4.3.2 (2018-02-16)
> 
> #### 🐛 Bug Fix
> * Update ember-qunit to 3.3.2 (fixing an issue with `waitUntil`)
> 
> #### Committers: 1
> - Robert Jackson ([rwjblue](https://github.com/rwjblue))
> 
> ## v4.3.1 (2018-02-11)
> 
> #### 🚀 Enhancement
> * [#204](https://github-redirect.dependabot.com/ember-cli/ember-cli-qunit/pull/204) Update dependencies to latest versions. ([[**rwjblue**](https://github.com/rwjblue)](https://github.com/rwjblue))
> 
> #### 🏠 Internal
> * [#200](https://github-redirect.dependabot.com/ember-cli/ember-cli-qunit/pull/200) Update RELEASE.md for lerna-changelog & travis deploy. ([[**kategengler**](https://github.com/kategengler)](https://github.com/kategengler))
> 
> #### Committers: 2
> - Katie Gengler ([kategengler](https://github.com/kategengler))
> - Robert Jackson ([rwjblue](https://github.com/rwjblue))
> 
> ## v4.3.0 (2018-01-17)
> 
> #### 🐛 Bug Fix
> * Update minimum version of ember-qunit to 3.3.0.
>   * [emberjs/ember-qunit#307](https://github-redirect.dependabot.com/emberjs/ember-qunit/pull/307) Remove `exception` method from QUnit test adapter when using Ember 2.17+.  ([[**rwjblue**](https://github.com/rwjblue)](https://github.com/rwjblue))
>   * [emberjs/ember-qunit#306](https://github-redirect.dependabot.com/emberjs/ember-qunit/pull/306) Update to QUnit 2.5.0. ([[**rwjblue**](https://github.com/rwjblue)](https://github.com/rwjblue))
>     * Adds `assert.rejects`.
>     * Reduces the delays around `assert.async` and returning promises from hook methods.
>     * Adds a native promise unhandled rejection handler.
>     * Fixes an issue with `notrycatch` mode being ignored for promises returned (e.g. it would previously always `.catch` every returned promise).
>   * [emberjs/ember-qunit#304](https://github-redirect.dependabot.com/emberjs/ember-qunit/pull/304) [BREAKING BUGFIX] Add validation for `Ember.onerror` in testing. ([[**rwjblue**](https://github.com/rwjblue)](https://github.com/rwjblue))
> 
> ## v4.2.1 (2017-12-18)
> 
> #### 🐛 Bug Fix
> * [#198](https://github-redirect.dependabot.com/ember-cli/ember-cli-qunit/pull/198) Update minimum version of ember-qunit. ([[**rwjblue**](https://github.com/rwjblue)](https://github.com/rwjblue))
>   * Ensures re-exports from ember-test-helpers are still present (with a deprecation).
>   * Ensures that `Ember.testing` is set properly from "normal" non `moduleFor*` and/or `setup*Test` style tests.
> 
> #### 🏠 Internal
> * [#197](https://github-redirect.dependabot.com/ember-cli/ember-cli-qunit/pull/197) Update ember-cli blueprint to 2.17.1.. ([[**rwjblue**](https://github.com/rwjblue)](https://github.com/rwjblue))
> 
> #### Committers: 1
> - Robert Jackson ([rwjblue](https://github.com/rwjblue))
> 
> ## v4.2.0 (2017-12-17)
> 
> #### 🚀 Enhancement
></table> ... (truncated)
</details>
<details>
<summary>Commits</summary>

- [`4ad1af2`](ember-cli/ember-cli-qunit@4ad1af2) release v4.4.0 🎉
- [`f4bd36b`](ember-cli/ember-cli-qunit@f4bd36b) Merge pull request [#212](https://github-redirect.dependabot.com/ember-cli/ember-cli-qunit/issues/212) from ember-cli/upgrade
- [`f32d88a`](ember-cli/ember-cli-qunit@f32d88a) bump ember-qunit
- [`63ac2f2`](ember-cli/ember-cli-qunit@63ac2f2) Merge pull request [#210](https://github-redirect.dependabot.com/ember-cli/ember-cli-qunit/issues/210) from samselikoff/upgrade-ember-qunit
- [`300b36c`](ember-cli/ember-cli-qunit@300b36c) Upgrade ember-qunit
- [`d3dc0f4`](ember-cli/ember-cli-qunit@d3dc0f4) v4.3.2
- [`f4897da`](ember-cli/ember-cli-qunit@f4897da) Add v4.3.2 to CHANGELOG.md.
- [`c3a2396`](ember-cli/ember-cli-qunit@c3a2396) Update ember-qunit to v3.3.2.
- [`ac4ea28`](ember-cli/ember-cli-qunit@ac4ea28) v4.3.1
- [`57b348a`](ember-cli/ember-cli-qunit@57b348a) Add v4.3.1 to CHANGELOG.md.
- Additional commits viewable in [compare view](ember-cli/ember-cli-qunit@v4.0.1...v4.4.0)
</details>
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