node_modules should be flatten.

[lygstate]

The node_modules too deep cause problems, cause many programs doesn't support for long path such cl.exe

[lygstate]

c1 : fatal error C1083: Cannot open source file: '..\..\..\..\..\..\..\..\..\..\..\..\Users\lygstate\AppData\Roaming\npm\node_modules\npm\node_module
s\node-gyp\src\win_delay_load_hook.c': No such file or directory [C:\CI-Cor\node_modules\karma\node_modules\socket.io\node_modules\socket.io-client\n
ode_modules\engine.io-client\node_modules\ws\build\bufferutil.vcxproj]
  validation.cc
..\src\validation.cc(112): warning C4996: 'NanSymbol': was declared deprecated [C:\CI-Cor\node_modules\karma\node_modules\socket.io\node_modules\sock
et.io-client\node_modules\engine.io-client\node_modules\ws\build\validation.vcxproj]
          C:\CI-Cor\node_modules\karma\node_modules\socket.io\node_modules\socket.io-client\node_modules\engine.io-client\node_modules\ws\node_module
  s\nan\nan.h(616) : see declaration of 'NanSymbol'
  win_delay_load_hook.c
c1 : fatal error C1083: Cannot open source file: '..\..\..\..\..\..\..\..\..\..\..\..\Users\lygstate\AppData\Roaming\npm\node_modules\npm\node_module
s\node-gyp\src\win_delay_load_hook.c': No such file or directory [C:\CI-Cor\node_modules\karma\node_modules\socket.io\node_modules\socket.io-client\n
ode_modules\engine.io-client\node_modules\ws\build\validation.vcxproj]

[vkurchatkin]

This is not an issue of io.js or node, rather an issue of npm.

nodejs/node-v0.x-archive#6960
npm/npm#5641