Tag to implement server-side cookie for CJ's click ID and setup concurrent tracking with inbound server to server (S2S).

1. Fix item level discount by multiplying with quantity
2. Add custom parameters on conversion
3. Allow for fully custom amount
4. Add advanced parameters, to customize event name, and cookie expiration time
5. Update readme and contributing
6. Remove signature mandatory
7. Send only affiliate events
8. Add ability to clear cookie on conversion
9. Fix discount values, url params insensitive, cjevent only and cookie deletion
10. Initial commit