Adding `owners` to story model

Note that owned_by_id is deprecated
Merge pull request #8 from amfleming/owners_details

Adding `owners` to story model
Merge pull request #9 from cwperry/retrieve-story-by-id-alone

Created the ability to lookup a story by story id without knowing the project id.
Added comment about new planned story state
Release 0.2.5
Merge remote-tracking branch 'upstream/master'
Updated Faraday to 0.9.0 so I could use tracker_api in conjunction with http://peter-murach.github.io/github/.

I had to add excon as a dependency and make VCR hook into it because of a bug in Faraday.  The discussion of the issue is here: https://github.com/vcr/vcr/issues/386