Add initial support for receiving async messages.
Adds BrowserView::onRecvAsyncMessage to handle messages.  Includes initial code for alert messages via console.
Merge qtmozembed with upstream changes as of 28/12/2013.
Add AbstractDialog class as base for all dialogues and an initial AlertDialog.
AbstractDialog based on that from cuteTube, allows for easier implementation of orientation specific layouts.
AlertDialog, although currently lacking input handling, demonstrates repositioning elements. It can be seen by typing javascript:alert("message"); in URL bar.
Merge remote-tracking branch 'parent/master'