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/renderer/atom_renderer_client.cc
: node_bindings_(NodeBindings::Create(false)),
      atom_bindings_(new AtomBindings) {
}
AtomRendererClient::~AtomRendererClient() {
}
void AtomRendererClient::WebKitInitialized() {
  blink::WebCustomElement::addEmbedderCustomElementName("webview");
  blink::WebCustomElement::addEmbedderCustomElementName("browserplugin");
  OverrideNodeArrayBuffer();
}
void AtomRendererClient::RenderThreadStarted() {
  content::RenderThread::Get()->AddObserver(this);
#if defined(OS_WIN)
  base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
  base::string16 app_id =
      command_line->GetSwitchValueNative(switches::kAppUserModelId);
  if (!app_id.empty()) {
    SetCurrentProcessExplicitAppUserModelID(app_id.c_str());
  }
#endif
}
void AtomRendererClient::RenderFrameCreated(