Automate building of Docker images

[chungers]

This adds automation of building docker containers to ease development. The build infrakit/bundle image is for development only and not meant for production deployment.

[GordonTheTurtle]

Please sign your commits following these rules:
https://github.com/docker/docker/blob/master/CONTRIBUTING.md#sign-your-work
The easiest way to do this is to amend the last commit:

$ git clone -b "circle_ci" git@github.com:chungers/infrakit.git somewhere
$ cd somewhere
$ git rebase -i HEAD~842354357944
editor opens
change each 'pick' to 'edit'
save the file and quit
$ git commit --amend -s --no-edit
$ git rebase --continue # and repeat the amend for each commit
$ git push -f

Amending updates the existing PR. You DO NOT need to open a new one.

[codecov-io]

Current coverage is 68.83% (diff: 100%)

Merging #339 into master will increase coverage by 0.06%

@@             master       #339   diff @@
==========================================
  Files            30         30          
  Lines          1569       1569          
  Methods           0          0          
  Messages          0          0          
  Branches          0          0          
==========================================
+ Hits           1079       1080     +1   
+ Misses          383        382     -1   
  Partials        107        107          

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[chungers]

I need to merge this in so that circle can build images on master.