+salt, new bindings for Erlang
Merge branch 'master' of github.com:jedisct1/libsodium

* 'master' of github.com:jedisct1/libsodium:
  void * casts for c++ compat
  Add blake2b_salt_personal()
  Add support for salt & personalization to Blake2. This API might change. I'm not a big fan of what we have now.
  Use blake2b_init() *or* blake2b_init_key(). Calling both is not needed.