Added hideScrollBar and scrollBarStyle attributes to XML and iOS implementation. However, iOS has a rendering problem with UIScrollViewIndicatorStyle Black and White. So, this attributes are implemented but not usable right now
Fix bug when open new window without params.
Merge branch 'master' of github.com:3dsinteractive/cocosnx

# By Methas Tariya
# Via Methas Tariya
* 'master' of github.com:3dsinteractive/cocosnx:
  Added hideScrollBar and scrollBarStyle attributes to XML and iOS implementation. However, iOS has a rendering problem with UIScrollViewIndicatorStyle Black and White. So, this attributes are implemented but not usable right now
Add SubWindow proxy to the view in C++.
Implement SubWindow::open and ::close.
Add SubWindowDelegate to nx.h.
Redesign SubWindow event onOpen and onClose, move from its delegate to the Window class.
Update HttpRequest to support setParameter.
Format source code of Test case for HttpClient.
Fix bug HttpClient in Android.
Implement close and open SubWindow in Android.
Fix png black background.
Change Tablet Navbar default height to 44.
Improve Bitmap scaling quality.
Fix error on SubWindow::close.
Implement View::bringToFront.
Update README.md
Formate Button Test case code.
Merge branch 'master' of github.com:3dsinteractive/cocosnx

# By Pong 3DS
# Via Pong 3DS
* 'master' of github.com:3dsinteractive/cocosnx:
  Update README.md
Update README.md