Add blake2b as a digest and mac
Update to new cfg syntax
Merge pull request #123 from ebfe/cfg

Update to new cfg syntax
Merge pull request #121 from PeterReid/blake

Add blake2b as a digest and mac
update: slice syntax
feature not required for slicing_syntax
put back correct slice_mut() call
final is now a reserved word per 1426f5834c96234bc1998921e889cfc5ca4893c8 in rust-lang/rust this changes instances of final to finalize and finalized
Merge pull request #125 from whackashoe/final-fix

final is now a reserved word, this changes instances of final to finalize(d)
Merge pull request #124 from kstep/master

update: slice syntax