This patch:
- reformats codebase to use 2-spaces instead of 4. This will
align the project with other codebases (e.g. DevTools and Lighthouse)
- enables eslint indentation checking
References #19
This patch:
- renames phantomjs folder into phantom_shim
- moves bin/puppeteer into a phantom_shim/runner.js and
merges the file with phantomjs/index.js
- removes "bin" field from the package.json - it is confusing
to have phantom shim installable
