Build: Generate runtime info with Visual Studio

The /GR tag has the same affect as the previous method of removing the
RunTimeInfo value in the binding.vcxproj
http://msdn.microsoft.com/en-us/library/we6hfdy0.aspx

binding.gyp

@@ -43,7 +43,16 @@
             'GCC_ENABLE_CPP_RTTI': 'YES',
             'MACOSX_DEPLOYMENT_TARGET': '10.7'
           }
-         }]
+         }],
+        ['OS=="win"', {
+          'msvs_settings': {
+            'VCCLCompilerTool': {
+              'AdditionalOptions': [
+                '/GR'
+              ]
+            }
+          }
+        }]
       ]
     }
   ]

precompiled/win32-ia32/README.md

-## Building bindings for Windows
-
-When compiling the bindings for Windows, make sure to remove every instance of the following line from the Visual Studio project file (build/binding.vcxproj)
-
-```xml
-<RuntimeTypeInfo>false</RuntimeTypeInfo>
-```
-
-This line is known to cause some incompatibility with libsass and node.js.
-
-[More details about the node-gyp issue](https://github.com/TooTallNate/node-gyp/issues/335)
\ No newline at end of file

precompiled/win32-x64/README.md

-## Building bindings for Windows
-
-When compiling the bindings for Windows, make sure to remove every instance of the following line from the Visual Studio project file (build/binding.vcxproj)
-
-```xml
-<RuntimeTypeInfo>false</RuntimeTypeInfo>
-```
-
-This line is known to cause some incompatibility with libsass and node.js.
-
-[More details about the node-gyp issue](https://github.com/TooTallNate/node-gyp/issues/335)
\ No newline at end of file