Ruby tdb 0.6.2 - fix for Ruby 1.9.3, new mailing list

This releases fixes builds under Ruby 1.9.3 thanks to a bug
report by Mark Sayer <mark.a.sayer@gmail.com> who reported
the issue via email.

Users on Ruby 2.0 and later are not affected by this release.
There are also minor bugfixes for users stuck on Ruby 1.8.

There are also minor build/packaging fixes.

Finally, there is a new, subscription-optional mailing list:

    ruby-tdb-public@bogomips.org

No subscription is required to post, and HTML will be considered spam
and rejected.  Subscription is optional, you may subscribe by sending
a blank email to:

    ruby-tdb-public+subscribe@bogomips.org

And following instructions in the confirmation email.
Similarly, you may unsubscribe by sending an email to:

    ruby-tdb-public+unsubscribe@bogomips.org

Mailing list archives are available at:

    http://bogomips.org/ruby-tdb-public/