PR includes major fix for desktop app

[Kanha-13]

This PR includes a bug fix for desktop-app.

• Fix for desktop-app: fileupload scenario #37
• Fix for desktop-app: terminate request #39
• Fix for desktop-app: running multiple requests parallelly crashes #40

Note:

Fix for #40 modifies the `lib/main.js`
Changes: In the `function start()` added a parameter `threadId`

Reason: child process forked by cluster required the thread id of its parent thread, for getting the config stored in a file which is 
named as `process.pid+threadId`

Why this kind of file name: because there was a need to make filename unique for every request fit from the UI, there fore this 
was the only way I could think of to make it unique and using any other approach was not able to pass the file name to the 
forked processes