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
Actually all projects that i have worked so far that have an autogen.sh script can be run as this:

    ./autogen.sh <configure parameters>
    make

It is really very common, and the idea is to make it easier to configure and build the first time :-). But if it will just make things worse lets remove it :-).

Maybe it is common only on gnome/gtk stuff, but i am pretty sure that in there it is extremely common :-) (specially because i got the idea from there :P).