Auto merge of #5605 - ember-cli:greenkeeper-diff-2.2.2, r=kellyselden
Auto merge of #5605 - ember-cli:greenkeeper-diff-2.2.2, r=kellyselden

Update diff to version 2.2.2 🚀

Hello :wave:

:rocket::rocket::rocket:

[diff](https://www.npmjs.com/package/diff) just published its new version 2.2.2, 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 diff – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging :palm_tree:

---
The new version differs by 151 commits .

- [`215195f`](https://github.com/kpdecker/jsdiff/commit/215195fabd356a11aa840d289b193bb44b3b9f44) `v2.2.2`
- [`e20b706`](https://github.com/kpdecker/jsdiff/commit/e20b706630b25cf8bda086e6ce617b20ff8569c6) `Update release notes`
- [`ef1ba9c`](https://github.com/kpdecker/jsdiff/commit/ef1ba9c856a641cc4c701c8ca01bfeda8cbd5bce) `Fix babel config for karma`
- [`f54173b`](https://github.com/kpdecker/jsdiff/commit/f54173b59310923594adef8869ab382fca968523) `Drop iojs from travis tests`
- [`2edfe19`](https://github.com/kpdecker/jsdiff/commit/2edfe1999293760c0e53eb141ad2ee959dff393a) `Drop node 0.10 from travis tests`
- [`1d7eef0`](https://github.com/kpdecker/jsdiff/commit/1d7eef041ad8c38e4ce8791e3c268aec76111848) `Add test coverage for json diff missing values`
- [`23163b2`](https://github.com/kpdecker/jsdiff/commit/23163b2f6742d281a3e42530dca7150c934f0a16) `Add toJSON support in diffJson`
- [`40ad336`](https://github.com/kpdecker/jsdiff/commit/40ad336895f1033982f2e35675dd35ceb20bfc20) `Safely handle empty diffs with whitespace`
- [`71ba9fc`](https://github.com/kpdecker/jsdiff/commit/71ba9fc3f5df157c4fafff9abd9e967bcebf218f) `Update module versions`
- [`e48c7dd`](https://github.com/kpdecker/jsdiff/commit/e48c7dd5313b34d66d64e606f1941a223a2854cf) `Update to babel 6`
- [`a8df4be`](https://github.com/kpdecker/jsdiff/commit/a8df4be634b12702fed6bfc36e7999e586009e51) `Relax parser when no file header name is provided`
- [`a525d02`](https://github.com/kpdecker/jsdiff/commit/a525d023103eb21942dc050ec1948af565a9c510) `Merge pull request #92 from bg451/typo-fix`
- [`abc8e32`](https://github.com/kpdecker/jsdiff/commit/abc8e32daa42d30707ef4962660ec79e307f61a0) `Fixes typo in the readme`
- [`0b8e83f`](https://github.com/kpdecker/jsdiff/commit/0b8e83f6208c98f28d5a833b32d86b44fdabea1c) `v2.2.1`
- [`74311ce`](https://github.com/kpdecker/jsdiff/commit/74311ce0e002db1c3cd5914b5b41aa81c6560a1f) `Update release notes`

There are 151 commits in total. See the [full diff](https://github.com/kpdecker/jsdiff/compare/018333d019ce280be622d08355e76545244ffca1...215195fabd356a11aa840d289b193bb44b3b9f44).

---
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