fix(client) : add sshkey encode in client update api call
fix(fleetctl.sh): clean up unitfiles from the filesystem

Once we submit them to fleet, we don't need them anymore.
feat(router) Avoid nginx 502, 503, 504 errors
fix(client): KeyError on cookie retrieval

Fixed an issue where 'no active controller' message didn't show if
cookies didn't already exist.
docs(reference): update client reference link

The client documentation should handle an internal link to client,
while the client reference should also get its own. There are no
known links to the client reference docs, so no other changes are
necessary at this time.
docs(reference): update reference guide
docs(reference): use deis <command> as title

This makes it such that when you reference the command in the
documentation as ":ref:`deis_releases`", it shows up as "deis releases".
ref(docs/reference): aggregate client commands
style(docs/reference): missing period
refactor(client): use semver for --version
feat(client): check server version

If the client sends a X-Deis-Version header to the server, a django
middleware class will validate and ensure that the versions are the
same. If they are not, the request is rejected, and a HttpResponse
object is returned with the client and server versions displayed.
fix(controller): reverse version output

Thanks johanneswuerbach for catching this!
test(controller): add django middleware tests
fix(client): `deis run` no longer requires remote

TESTING: try to run a command outside of the git repository:

    $ cd ..
    $ deis run --app=foo ls

If you're running a command that contains an option flag like `ls -al`, you can specify the `--`
option beforehand:

    $ deis run --app=foo -- ls -al

fixes #1086
Merge pull request #1347 from deis/878-cleanup_unitfiles

fix(fleetctl.sh): clean up unitfiles from the filesystem
Merge pull request #1360 from soficom/nginx_50x_errors

feat(router) Avoid nginx 502, 503, 504 errors
feat(contrib): add usage to DigitalOcean script
feat(contrib): allow private networked regions
Merge pull request #1283 from smothiki/clientfix

fix(client) : add sshkey encode in client update api call
feat(builder): cache progrium/cedarish image

This will reduce boot time significantly by making the images
for progrium/cedarish (the image that both deis/slugrunner and
deis/slugbuilder rely on) loaded into the docker daemon before the
deis/slug* images are pulled from the registry.