Docker::Image.create now sets the id correctly.

I'm a bit surpised that this has not been an issue thus far.
Now extracting the ID as if the response was JSON

This took a bit of regex magic, but hopefully they'll fix the remote api
to ACTUALLY return JSON.
Re-record broken/verbose VCRs.
Version bump 1.8.4
Merge pull request #97 from swipely/add-correct-id-to-image-create

Docker::Image.create now sets the id correctly.