NPM error after release #225

Hello, after your new release, an exception occurs when I do "npm install adapterjs --save". It seem to be caused by "postinstall": "npm --prefix third_party/adapter install third_party/adapter" inside package.json :

npm ERR! code EPERM
npm ERR! errno -4048
npm ERR! syscall rename
npm ERR! Error: EPERM: operation not permitted, rename 'E:\MesProjets\JDL\meteor-exemple\exemple\node_modules\adapterjs\third_party\adapter\node_modules.staging\is-property-8d23152c\package.json.3623421401' -> 'E:\MesProjets\JDL\meteor-exemple\exemple\node_modules\adapterjs\third_party\adapter\node_modules.staging\is-property-8d23152c\package.json'
npm ERR! at Error (native)
npm ERR! { [Error: EPERM: operation not permitted, rename 'E:\MesProjets\JDL\meteor-exemple\exemple\node_modules\adapterjs\third_party\adapter\node_modules.staging\is-property-8d23152c\package.json.3623421401' -> 'E:\MesProjets\JDL\meteor-exemple\exemple\node_modules\adapterjs\third_party\adapter\node_modules.staging\is-property-8d23152c\package.json']
npm ERR! errno: -4048,
npm ERR! code: 'EPERM',
npm ERR! syscall: 'rename',
npm ERR! path: 'E:\MesProjets\JDL\meteor-exemple\exemple\node_modules\adapterjs\third_party\adapter\node_modules.staging\is-property-8d23152c\package.json.3623421401',
npm ERR! dest: 'E:\MesProjets\JDL\meteor-exemple\exemple\node_modules\adapterjs\third_party\adapter\node_modules.staging\is-property-8d23152c\package.json',
npm ERR! parent: 'webrtc-adapter' }
npm ERR!
npm ERR! Please try running this command again as root/Administrator.
npm ERR! Please include the following file with any support request:
npm ERR! E:\MesProjets\JDL\meteor-exemple\exemple\node_modules\adapterjs\npm-debug.log
npm ERR! Windows_NT 10.0.14393
npm ERR! argv "C:\Users\Hassane\AppData\Local.meteor\packages\meteor-tool\1.4.1_1\mt-os.windows.x86_32\dev_bundle\bin\node.exe" "C:\Users\Hassane\AppData\Local.meteor\packages\meteor-tool\1.4.1_1\mt-os.windows.x86_32\dev_bundle\lib\node_modules\npm\bin\npm-cli.js" "install" "--save" "adapterjs"