Add bootstrap script

This is to initialize automatically the repository with autoreconf.
It's the common name to use for that script (also used is "autogen.sh").

Update INSTALL file with bootstrap script

Fixes #10
Signed-off-by: David Goulet <dgoulet@ev0ke.net>

INSTALL

@@ -18,7 +18,7 @@ COMPILING
 If you're got a CVS copy, you will need to regenerate the configure
 script using:
 
-    autoreconf -s -i
+    ./bootstrap
 
 Once you have the configure script (which comes with the source
 deistribution), run it with the "--with-pic" option, as well as any

bootstrap

+#!/bin/bash
+
+set -x
+
+if [ ! -e config ]; then
+	mkdir config
+fi
+
+autoreconf -i