Ubuntu 12.04, vscode 0.10.1

Currently when you run Code if there is an instances already running (or shift clicking the app icon in Windows/Ubuntu) it will activate the currently opened window. This should open a new instance, the same goes for opening a new instance of Code with a folder as an argument when an instance is already open.

It's a very common use case for many developers to have multiple editors with the same folder open.

Repro:

1. Code (open instance of vscode)
2. Code

Expected:
A new instance of vscode is opened

Actual:
The current instance of vscode is activated