Now resetting the Connection on every request.

This fixes a bug that occurs when an invalid request is made, and then
another request is made after that.
Added Docker::Image#run.

This convenience method takes a command String, and then runs it on a
new Container with the calling Image as the Image.
Version bump 0.1.1
Fixed Docker::Image#insert.

Since we `cd` into the directory of the temporary Dockerfile, I was able
to remove the path.
Now starting the generated Docker::Contaner on Docker::Image#run; added
default options to Docker::Container#attach.
Merge pull request #10 from swipely/add-image-run

Add image run