Tweak how options[:temporal] is handled

[pnomolos]

I still need to write specs for this, but it changes how options[:temporal] is handled so that if you don't pass anything explicit it'll work fine (rather than right now, where if you don't specify temporal: true on a chronomodel-handled table it'll return it to a plain table).

[pnomolos]

Looks like this project has begun to be maintained again, so I've merged upstream master. If this PR is still useful would it be possible to get it in the next release?

[tagliala]

Hi, same considerations as the other PR. Any chance to rebase instead of merge and provide a failing test case?

[pnomolos]

@tagliala I've finally come back to this, including adding specs and reworking some functionality. I hope it's good to go now, please let me know if you'd like any further changes