Fix dist.sh to handle the book for 1.2.x and newer.
Fix dist.sh to handle the book for 1.2.x and newer.

* dist.sh: Detect if the book source dir is there and use it as the
    destination for the book, if not use the higher level directory.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion