Use WebView (webkit) instead of QTextBrowser for article display

[cip]

Potential benefit:

1. Better kinetic scrolling
2. Nicer layout. (With css).
   Not sure whether really not possible with qtextbrowser.loadresource, but with webview its easier to load
   css than not loading it. (Due to image support)
3. Should finally be portable to meego
   (See Article pages issues on harmattan #71)

Potential drawback:

1. Performance worse
   I.p. if lots of images in articles.
   Also scrolling jerky after load due to images.
   May make sense to consider a similar resize approach as used in qtextbrowser implementation.
2. Scroll to anchor not working out of the box (and is not easy to add).
   Perhaps possible using javascript

Other??