Gtk gui

Please pull to receive a simple GTK3 GUIVir for the stlink application.

The GUI supports viewing the memory of a device as well as the file to be flashed.
It can flash at the address you instruct it to. It supports drag and drop.

It has only been tested with stlinkv2 but code is stolen from the st-flash applicaiton so
stlinkv1 could work :)

It requires gtk+3.0 and glib > 2.32.0 and has been tested on Ubuntu 12.04.

/Jonas