0.4

• Most constants and operations are now available as actual functions
  instead of macros, making it easier to use from other languages.
• New operation: crypto_generichash, featuring a variable key size, a
  variable output size, and a streaming API. Currently implemented using
  Blake2b.
• The package can be compiled in a separate directory.
• aes128ctr functions are exported.
• Optimized versions of curve25519 (curve25519_donna_c64), poly1305
  (poly1305_53) and ed25519 (ed25519_ref10) are available. Optionally calling
  sodium_init() once before using the library makes it pick the fastest
  implementation.
• New convenience function: sodium_memzero() in order to securely
  wipe a memory area.
• A whole bunch of cleanups and portability enhancements.
• On Windows, a .REF file is generated along with the shared library,
  for use with Visual Studio. The installation path for these has become
  $prefix/bin as expected by MingW.