0.5.0

• sodium_mlock()/sodium_munlock() have been introduced to lock pages
  in memory before storing sensitive data, and to zero them before
  unlocking them.
• High-level wrappers for crypto_box and crypto_secretbox
  (crypto_box_easy and crypto_secretbox_easy) can be used to avoid
  dealing with the specific memory layout regular functions depend on.
• crypto_pwhash_scryptxsalsa208sha256* functions have been added
  to derive a key from a password, and for password storage.
• Salsa20 and ed25519 implementations now support overlapping
  inputs/keys/outputs (changes imported from supercop-20140505).
• New build scripts for Visual Studio, Emscripten, different Android
  architectures and msys2 are available.
• The poly1305-53 implementation has been replaced with Floodyberry's
  poly1305-donna32 and poly1305-donna64 implementations.
• sodium_hex2bin() has been added to complement sodium_bin2hex().
• On OpenBSD and Bitrig, arc4random() is used instead of reading
  /dev/urandom.
• crypto_auth_hmac_sha512() has been implemented.
• sha256 and sha512 now have a streaming interface.
• hmacsha256, hmacsha512 and hmacsha512256 now support keys of
  arbitrary length, and have a streaming interface.
• crypto_verify_64() has been implemented.
• first-class Visual Studio build system, thanks to @evoskuil
• CPU features are now detected at runtime.