It doesn't look very good for "native" apps to overscroll when scrolling. Would be nice to have a BrowserWindow option to disable overscroll

![untitled12](https://cloud.githubusercontent.com/assets/170270/15033357/fc36e32e-1293-11e6-8cdc-6c17b0f504dd.gif)
## 
- Electron version: 0.37.8
- Operating system: OS X 10.11.4

atom/common/options_switches.cc
#include "atom/common/options_switches.h"
namespace atom {
namespace options {
const char kTitle[]          = "title";
const char kIcon[]           = "icon";
const char kFrame[]          = "frame";
const char kShow[]           = "show";
const char kCenter[]         = "center";
const char kX[]              = "x";
const char kY[]              = "y";
const char kWidth[]          = "width";
const char kHeight[]         = "height";