Modernization

[dsblv]

This PR is about making this repo appear cooler in users' eyes. It's important if you want to dominate among other similar mdules.

It includes:

• Addition of .editorconfig to simplify following your code style
• Addition of .gitattributes to ensure line endings are being normalized by git
• Removal of .npmignore in favor of files key in package.json
• Linting with XO that is a wrap around eslint with simpler API and sensible set of rules
• Testing with AVA. Just check new test.js out!
• A few package.json tweaks

This one is very opinionated, so feel free to decline :wink:

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I also encourage you to use travis with .travis.yml like this and stick a badge to the readme so everyone knows your tests are passing.

[conceptualitis]

At a glance I'm fine with these changes. I probably won't add Travis, because I don't want to use any more resources than this joke repo is already consuming :laughing: