Move README.md to user_manual.md
Made docs/README.md be a directory of what we have.
Make top level README source links relative.

This way things work if you're on a branch.  Also fix link
to the user manual.
Show which arguments are optional
Report job status when pulling an image.

Give some feedback when a TemporaryJob is busy pulling an image from the repo.
Merge pull request #133 from spotify/drewc/doc-rework

Make the docs/ directory a little easier to use/make sense of
Updated testing framework doc to use service registration/discovery
Merge pull request #135 from spotify/rculbertson/testing-doc-update

Updated testing framework doc to use service registration/discovery
Merge pull request #134 from spotify/kobolog/verbose-temporary-jobs

Report job status when pulling an image.
Fix HOST_NAME_MAX to 63, per the DNS RFC
Merge pull request #136 from spotify/drewc/fix-dns

Fix HOST_NAME_MAX to 63, per the DNS RFC
Warning fixes.

Mostly using try with resources to clean up docker clients