0.2.0

• Better documentation with examples including comment for set_key, better formatting
• Better error handling and more consistent returned data structures for url_report, file_report, rescan_file
• url_report now accepts scan_id as a param
• Warning messages end with new line
• Added more tests, specifically checking returns to what happens when params/hash are incorrect
• Enforces rate limiting --- 4 queries per minute.
• Graceful error handling if error limit exceeded.