Bumped version to 0.7.0

* Now using Process.spawn instead of Kernel.system, the ruby way for
* 1.9+
* Fixed subcommand process deadlocking when any IO pipe buffer became
* full (Ruby 1.9+) via
  threads and process waiting, the ruby way or a ruby way at least ;)
* $HADUPILS_TMP_TTL now defaults to 1209600 (last 2 weeks)
* Passing unit tests