Update install to version 0.2.2 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

install just published its new version 0.2.2, 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 install – 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 17 commits .

• 54ec6ef Bump NPM version to 0.2.2 in preparation for publishing.
• 0f2f6c3 Add install.min.js to the .gitignore file.
• fb7869d Publish docs to gh-pages branch in prepublish hook.
• 7b338a0 Use the prepublish hook to build docs.
• 82caa6d Ignore the test directory.
• 6799735 Update LICENSE and package.json.
• fb3f733 Bump NPM version to 0.2.1 in preparation for publishing.
• 3fe2bb9 Add build status badge to README.md.
• 27ef765 Bump NPM version to 0.2.0 in preparation for publishing.
• 9410736 Minify install.js in a prepublish hook.
• 03870be Update the "engine" field in package.json.
• 9f4b318 Don't bother testing in Node 0.8 and earlier.
• d34ded9 Can't use a caret version in Node 0.6.
• 3e0eaaf Update the .travis.yml with new Node versions.
• b90aaad Add a .gitignore file.

There are 17 commits in total. See the full diff.