Use memset_s() only if compiling in C11 mode.
Use explicit_bzero if available
Check for memset_s availability the hard way.
Do not check for __STDC_VERSION__ any more to use memset_s()
Fix indentation
Avoid unaligned access in smult_curve25519_donna_c64.c if required
smult_curve25519_donna_c64.c assumes little-endian.
Stricter autoconf checks for MMX/SSE2/SSE3
pwhash: return a zeroed output buffer on error paths.
Merge remote-tracking branch 'evoskuil/master'

* evoskuil/master:
  Update VS2010/2012 import props to match 2013.
  Update NuGet packaging.
  Modify VS props config for easy variation of output locations and messages.
  Use explicitly Unicode Win32 APIs.
  Update Visual Studio projects and packaging.
Merge pull request #153 from evoskuil/master

Remove VS imports custom props dep, batch VS builds.
Mention the new Visual Studio build system
Match crypto_generichash_blake2b_{saltbytes/personalbytes} with prototypes.
Remove crypto_generichash_blake2b -> crypto_generichash_blake2b_ref macro
Make aes256 tables static
Rename cpu_features global to _cpu_features
Mention that CPU features are not detected at runtime.
More crypto_pwhash tests
Switch opslimit and memlimit in pwhash, to be closer to PHC's proposed API.
Move "bindings for other languages" up