title: NPM error installing "sse4_crc32"
body: <p>I was initially getting this error as a dependency for a different package, but it fails when I try it on its own too. Since it's the first time I'm trying to install a node.js package, I'm sure I'm missing something, but what?</p>
  
  <pre>
  $ npm install --save sse4_crc32
  \
  > sse4_crc32@3.3.0 install /home/agam/node_modules/sse4_crc32
  > node-gyp rebuild
  
  make: Entering directory '/home/agam/node_modules/sse4_crc32/build'
    CXX(target) Release/obj.target/sse4_crc32/src/sse4_crc32.o
  In file included from ../src/sse4_crc32.cpp:18:0:
  ../node_modules/nan/nan.h: In constructor ‘Nan::Utf8String::Utf8String(v8::Local)’:
  ../node_modules/nan/nan.h:1178:27: error: ‘REPLACE_INVALID_UTF8’ is not a member of ‘v8::String’
                             v8::String::REPLACE_INVALID_UTF8;
                             ^
  sse4_crc32.target.mk:87: recipe for target 'Release/obj.target/sse4_crc32/src/sse4_crc32.o' failed
  make: *** [Release/obj.target/sse4_crc32/src/sse4_crc32.o] Error 1
  make: Leaving directory '/home/agam/node_modules/sse4_crc32/build'
  </pre>