Initial stab at digital signatures
Utility to prepend zeroes required by NaCl
Utilities to deal with the C library, prepend zeros,
check if the key size is valid, split byte arrays
Integration with the C library to generate digital signatures
Responsible to validate digital signatures against the C library

Logging for debug purposes
fix property access and small cleanup
Unit testing Util spec
Unit testing digital signatures validation
Inclusion of documentation for Ed25519