Use blanket for easy coverage reporting for Mocha JavaScript tests.

### Quickstart guide

Install blanket:

    npm i --save-dev blanket

In your test helpers, use Blanket before `require`ing:

    if (process.env.COVERAGE) {
      require('blanket')({
        pattern: require('path').resolve('./index.js')
      });
    }
    thing = require('../index');

Add to `package.json`:

    "scripts": {
      "coverage": "env COVERAGE=1 mocha -R html-cov > coverage.html && open coverage.html"
    }

Be sure to ignore it:

    echo "coverage.html" >> .gitignore

Then run:

    npm run coverage

### Travis + coveralls.io support

Visit coveralls.io then activate your repo. Then install the appropriate packages:

    npm i --save-dev mocha-lcov-reporter coveralls

Add this to `.travis.yml`:

    after_success:
      - ./node_modules/.bin/mocha -R mocha-lcov-reporter | ./node_modules/coveralls/bin/coveralls.js

Commit, push, wait for Travis to finish.

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