Update crawl.php

- Removed file_get_contents as this function was not designed to fetch HTML content and behaves unexpected on certain pages. CURL is the only way to go now.
- Every instance will print its results as soon as it finished, thus we don't have to pass the whole email array to each sub-instance => less overhead.
- Additional information provided on array output
- printResults works now properly
- Some really, really minor fixes (not worth mentioning)