Dev

• Implemented #8 (closed) #9 (closed) #11 (closed)
• Switched to using environment variables instead of config files
• Added the ability to start many workers in parallel
• Cleaned the code and comments
• Added proper Tor STEM integration to control exit nodes
• Added Tor Browser security level support
• Added curl and curl_over_tor fetchers
• Added Cloudflare API connection
• Started using pytest
• Increased the modularity of the code
• Changed the way queue was implemented in the database