Update ember-cli-qunit to version 1.4.0 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

ember-cli-qunit just published its new version 1.4.0, which is not covered by your current version range.

If this pull request passes your tests you can publish your software with the latest version of ember-cli-qunit – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging :palm_tree:

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The new version differs by 37 commits .

• 75c5c78 Release v1.4.0.
• 3b1a855 Merge pull request #108 from mitchlloyd/jshint-lint
• b855841 Change nolint option to exclude lint-test modules
• 2e2bf6e Add POC test
• 98b227d Get tests running
• cce7723 Release v1.3.0.
• ba906ca Merge pull request #107 from ember-cli/update-concat
• 0c61e34 Use broccoli-concat instead of broccoli-soucremap-concat which has been merged back into broccoli-concat
• 282f6f6 Merge pull request #105 from Turbo87/test-generator
• 721acac Use generateTestFile() to generate JSHint tests
• b08ebc0 Override generateTestFile() method of the Project instance
• 87082fb Release v1.2.4.
• 0767da2 Take 3. Grrrrr.
• 502479a Release v1.2.3.
• 770c4c2 Fix stupid mistake.

There are 37 commits in total. See the full diff.

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