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
I guess it would be helpful for first-timers. 

Personally, I wouldn't use it because I build in a subdirectory and need to run ../configure from there.

How about actually agreeing on a specific build directory and the script creates it (if not already present) and cd 's into it? I call mine "x"because it's short and for want of a better name ;-)