Adding a very simple autogen.sh that calls autoreconf and configure

There is no check for libtool yet, not quite sure of the best way to do this
@katcipis According to the autoconf manual:
http://www.gnu.org/software/automake/faq/autotools-faq.html#What-does-_002e_002fbootstrap-or-_002e_002fautogen_002esh-do_003f
It should just do autoreconf. Not sure why the gnome projects do more...