[STUMP] build system rework + quicklisp-based build instructions

[Ben Spencer]

Hi all,

I've been working on a streamlined version of the stumpwm build
system, with Quicklisp-based build instructions in the README.  You
can see the results in the 'build' branch of:

git://gitorious.org/~dangerousben/stumpwm/bens-stumpwm.git

I'm working on the assumption that inexperienced users will use
Quicklisp, while leaving experienced users free to do things how they
like.  To this end ASDF is no longer bundled, and you no longer need
to specify the location of cl-ppcre to configure.

I'd appreciate it if people could try this out with their setups and
let me know of any issues they encounter.

Thanks, Ben