Add libevent2 implementation
Ignore binary and object files
Set prefix in its own variable, rather than hardcoding
Read string directly from buffered event
Remove read timeout functionality
It helps to read the README

Actually do nonce calculation, derp.
Don't print error to stderr if we get a read error AND eof
Merge pull request #7 from oogali/a-new-challenger-appears

C + libevent2 implementation – thanks Omachonu!