Merge pull request #86 from timbueno/master

json fix for issue
/titles/{id}/issues/ doesnt return issue without a release date
added latest released issue information to `to_json()` method on Title object. gave Title object `get_latest_released_issue()` method.
entire latest issue json loaded into title json
changed ordering to Ascending
debugging
back to ascending
more debugging
I think i nailed it.
removed default ordering on issues back reference in title object. this fixes all my problems
added latest issue to title json

Merge branch 'release/v0.6.9'