Fix demo: wrong pid on windows #567

[coderaiser]

Looks like pid on windows is wrong. There is such issue in pty.js repo maybe it is still not fixed in node-pty. Anyway changing the way of killing process works for me.

> [email protected] start C:\Users\coderaiser\Documents\GitHub\xterm.js
> node demo/app

App listening to http://127.0.0.1:3000
Created terminal with PID: 928
Connected to terminal 928
internal/process.js:173
      throw errnoException(err, 'kill');
      ^

Error: kill ESRCH
    at exports._errnoException (util.js:1022:11)
    at process.kill (internal/process.js:173:13)
    at WebSocket.<anonymous> (C:\Users\coderaiser\Documents\GitHub\xterm.js\demo\app.js:72:13)
    at emitTwo (events.js:111:20)
    at WebSocket.emit (events.js:191:7)
    at WebSocket.cleanupWebsocketResources (C:\Users\coderaiser\Documents\GitHub\xterm.js\node_modules\ws\lib\WebSocket.js:950:8)
    at emitOne (events.js:101:20)
    at Socket.emit (events.js:188:7)
    at emitErrorNT (net.js:1281:8)
    at _combinedTickCallback (internal/process/next_tick.js:74:11)

npm ERR! Windows_NT 10.0.14393
npm ERR! argv "C:\\Program Files\\nodejs\\node.exe" "C:\\Program Files\\nodejs\\node_modules\\npm\\bin\\npm-cli.js" "start"
npm ERR! node v7.2.0
npm ERR! npm  v3.10.9
npm ERR! code ELIFECYCLE
npm ERR! [email protected] start: `node demo/app`
npm ERR! Exit status 1

[coveralls]

Coverage remained the same at 67.786% when pulling 43558fa on coderaiser:patch-1 into 8693d06 on sourcelair:master.

[Tyriar]

Makes sense, this part of the code wasn't changed when I adopted node-pty. Thanks for looking into this @coderaiser 😃