error when installing plugin
Hi, 

when i try to install the plugin i keep getting this error:

```
> raw-socket@1.5.1 install /usr/lib/node_modules/homebridge-wol/node_modules/raw-socket
> node-gyp rebuild

gyp ERR! configure error 
gyp ERR! stack Error: EACCES: permission denied, mkdir '/usr/lib/node_modules/homebridge-wol/node_modules/raw-socket/build'
gyp ERR! stack     at Error (native)
gyp ERR! System Linux 4.8.0-36-generic
gyp ERR! command "/usr/bin/nodejs" "/usr/lib/node_modules/npm/node_modules/node-gyp/bin/node-gyp.js" "rebuild"
gyp ERR! cwd /usr/lib/node_modules/homebridge-wol/node_modules/raw-socket
gyp ERR! node -v v6.11.1
gyp ERR! node-gyp -v v3.6.2
gyp ERR! not ok 
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! raw-socket@1.5.1 install: `node-gyp rebuild`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the raw-socket@1.5.1 install script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /home/jort/.npm/_logs/2017-07-20T19_03_06_798Z-debug.log
```

I don't know what I am doing wrong, since im an inexperienced coder!
would love to get an experts opinion on this!

thank you,
Jort