The WebKit2 port is "read for use"

The WebKit2 port is "read for use"

Addressing the issues mentioned in the README:

- I'm using it every day and I haven't found any more bugs (in lariza).
- "View source" mode is still not implemented. However, I don't see any
  other way than re-downloading the current weg page and showing the
  results in some to-be-written widget that displays text (+ HTML syntax
  highlighting + maybe other stuff). That's quite a lot of overhead for
  a rarely used feature, so I decided to drop it.
- That "annoying border around the WebView widget" is related to my gtk
  theme (upstream "Raleigh"). Adwaita, the current GTK+ 3 default theme,
  does not have that border.

tl;dr: The WebKit2 port is as ready as it can get and it's "more bug
free" than the WebKit1 version.