Load versions from association instead of preloaded list.
Load versions from association instead of preloaded list.

The model should be falling back to created_at for published_at
already.

And, these are the attributes we're not plucking already, so
shouldn't be a big deal to include them too:

* updated_at (datetime)
* runtime_dependencies_count (int)
* status (string)

librariesio/libraries.io,librariesio/libraries.io,librariesio/libraries.io,librariesio/libraries.io