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(Makefile): remove redundant command parameter
chore(CHANGELOG.md): update for v0.10.0
Revert "docs(*): remove Rackspace support"

This reverts commit e897c8b7e7ce4cab15787c20338ab1ab72cff2e6.
chore(contrib/rackspace): bump to CoreOS 379.3
chore(docs): update CLI versions and download links
chore(release): switch master to v0.11.0
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
Merge pull request #1401 from deis/fix-list-machines-dup

fix(Makefile): remove redundant command parameter
Merge pull request #1411 from deis/restore_rackspace

Restore rackspace
fix(*): etcdctl and docker history commands eat error output

These errors are benign, but confusing to new users.

TESTING: reprovision a cluster (due to changes in cloud config), build
components from source, `make run`, and ensure that there are no
confusing errors in the output

```console
$ vagrant destroy -f && vagrant up
$ make build run
```

```
$ fleetctl status deis-router.1
< snipped... >
Jul 23 19:18:53 deis-1 systemd[1]: Starting deis-router...
Jul 23 19:18:54 deis-1 systemd[1]: Started deis-router.
Jul 23 19:19:06 deis-1 sh[4546]: router: waiting for confd to write initial templates...
Jul 23 19:19:11 deis-1 sh[4546]: Starting Nginx...
Jul 23 19:19:11 deis-1 sh[4546]: deis-router running...
```
Merge pull request #1407 from deis/etcdctl_eat_errors

fix(*): etcdctl and docker history commands eat error output
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
Merge pull request #1283 from smothiki/clientfix

fix(client) : add sshkey encode in client update api call