Build, install and run:
gulp vscode-linux-packages
sudo dpkg -i out-linux/vscode-amd64.deb
code .

Installing the package does the following:
- Puts VSCode dir at /usr/share/code
- Puts code.sh launcher in /usr/bin
- Defines a .desktop file to properly integrate with the launcher

Fixes #2679

Add -h/-v command line args and unified launch scripts

This reverts commit f7147585.

fixes #2785

fixes #2742

fixes #2839

fixes #2846

related to #2785

On Mac, since windows-mutex is not installed, an npm install with npm 3 otherwise seems to fail.