Allow running phantom tests on Windows. These were relying on #!/usr/bin/env node at the top of runner.js, which doesn't work outside of a unix environment.
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
