Node 4.x support

[caldwell]

I installed node 4.1.1 (4.2.1 is just entering Debian, now) and I'm getting a bunch of errors while compiling:

  CXX(target) Release/obj.target/navcodec/src/navcodec.o
In file included from ../src/navformat.h:25:0,
                 from ../src/navcodec.h:22,
                 from ../src/navcodec.cpp:22:
../src/navstream.h:35:36: error: expected class-name before ‘{’ token
 class NAVStream : node::ObjectWrap {
                                    ^
../src/navstream.h:47:34: error: ‘Arguments’ does not name a type
   static Handle<Value> New(const Arguments& args);
                                  ^
In file included from ../src/navcodec.h:22:0,
                 from ../src/navcodec.cpp:22:
../src/navformat.h:37:36: error: expected class-name before ‘{’ token
 class NAVFormat : node::ObjectWrap {
                                    ^
../src/navformat.h:51:34: error: ‘Arguments’ does not name a type
   static Handle<Value> New(const Arguments& args);
                                  ^
../src/navformat.h:54:38: error: ‘Arguments’ does not name a type
   static Handle<Value> Version(const Arguments& args);
                                      ^
../src/navformat.h:55:37: error: ‘Arguments’ does not name a type
   static Handle<Value> Decode(const Arguments& args);
                                     ^
../src/navformat.h:56:35: error: ‘Arguments’ does not name a type
   static Handle<Value> Dump(const Arguments& args);
                                   ^
../src/navformat.h:64:42: error: expected class-name before ‘{’ token
 class DecoderNotifier : node::ObjectWrap {
                                          ^
../src/navformat.h:77:35: error: ‘Arguments’ does not name a type
   static Handle<Value> Done(const Arguments& args);
                                   ^
In file included from ../src/navcodec.h:23:0,
                 from ../src/navcodec.cpp:22:
../src/navcodeccontext.h:36:20: error: ‘AccessorInfo’ does not name a type
              const AccessorInfo& info);
                    ^
../src/navcodeccontext.h:38:42: error: expected class-name before ‘{’ token
 class NAVCodecContext : node::ObjectWrap {
                                          ^

There are more, too, but they're all along the same lines. I assume this is because of the V8 changes in the newest node (from the io.js merger). Are there any plans to support the latest version?