- Move to new scheme with some hashing, sigs, and a random user key. close#13
- Change to sha256 rather than sha1 (temporary, but i guess its slightly more secure which is nice for now) ref #10
- Change POW output checked value
- Add lib for randombytes, udpate lua sha lib
- Remove outdated difficulty checks in frontend (was hardcoded 0 anyway) and since algo change is coming soon, there is no need to keep it
- Reduce the default concurrency of the frontend script to 2 threads because any higher seems to crash firefox (and its quick enough even with 2 threads anyway)
- Remove the footerlogo from challenge and maintenance page, and update the link