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
const char kMinWidth[]       = "minWidth";
const char kMinHeight[]      = "minHeight";
const char kMaxWidth[]       = "maxWidth";
const char kMaxHeight[]      = "maxHeight";
const char kResizable[]      = "resizable";
const char kMovable[]        = "movable";
const char kMinimizable[]    = "minimizable";
const char kMaximizable[]    = "maximizable";
const char kFullScreenable[] = "fullscreenable";
const char kClosable[]       = "closable";
const char kFullscreen[]     = "fullscreen";
const char kSkipTaskbar[] = "skipTaskbar";
const char kKiosk[] = "kiosk";
const char kAlwaysOnTop[] = "alwaysOnTop";
const char kAcceptFirstMouse[] = "acceptFirstMouse";
const char kUseContentSize[] = "useContentSize";
const char kTitleBarStyle[] = "titleBarStyle";
const char kAutoHideMenuBar[] = "autoHideMenuBar";
const char kEnableLargerThanScreen[] = "enableLargerThanScreen";
const char kDarkTheme[] = "darkTheme";
const char kTransparent[] = "transparent";
const char kType[] = "type";
const char kDisableAutoHideCursor[] = "disableAutoHideCursor";
const char kStandardWindow[] = "standardWindow";
const char kBackgroundColor[] = "backgroundColor";
const char kHasShadow[] = "hasShadow";
const char kWebPreferences[] = "webPreferences";
const char kZoomFactor[] = "zoomFactor";
const char kPreloadScript[] = "preload";
const char kPreloadURL[] = "preloadURL";