fix(registry): fix S3 config options

This fixes two S3 settings that were not being properly set.
Changes proposed by @aledbf

closes #1065, #1066
fix(router): Add configuration Ingress8000 in deis template for EC2

Routers are unable to communicate with remote controllers missing AWS::EC2::SecurityGroupIngress configuration for port 8000.
Merge pull request #1093 from smothiki/smothiki-fix-ec2-deis-template

fix(router): Add configuration Ingress8000 in deis template for EC2
fix(builder): decouple from controller

closes #1097
replaces #1089
fix(router): increase timeouts and survive controller/builder failures

Bumps the timeouts to 20 minutes and wraps the builder and controller
proxies in `if` clauses to prevent the router from crashing when
either controller or builder are restarted.

Also adds a generic health-check URL to be used for load balancers,
and an X-Deis-Upstream header.

TESTIING: rebuild and restart the router:

```console
	$ make -C router/ build restart
```

closes #1096, #1098, #1078, #1081
replaces #1080, #1057
Merge pull request #1073 from deis/fix_s3_template

fix(registry): fix S3 config options
fix(contrib): check that coreos/user-data has a discovery_url set
Merge pull request #1102 from deis/decouple_builder_and_controller

fix(builder): decouple from controller
Merge pull request #1101 from deis/resilient_router

fix(router): increase timeouts and survive controller/builder failures
fix(vagrant): disable vagrant cachier if present

Vagrant cachier trys to use vboxfs mounts if it is installed. Disable it if present.
docs(CONTRIBUTING): add allowed types

I often find myself stumbling to the docs just to look for the allowed
types.
chore(CHANGELOG.md): update for v0.9.1 release
Merge pull request #1113 from deis/add-types

docs(CONTRIBUTING): add allowed types
fix(readthedocs): install CLI requirements explicitly

Readthedocs.org began failing to generate our Python code autodocs
recently. Purging the build environment (use https://readthedocs.org/wipe/deis/latest/)
did not help. Their logs indicate Sphinx is confused by a version of
the urllib3 library that happens to be installed in the system python.
This packaging error was fixed in urllib3 1.8.2, see https://pypi.python.org/pypi/urllib3.
This adds the client's requirements explicitly to the docs_requirements.txt
so that this broken version of urllib3 isn't used.

This is also fixed by requests 2.3.0, but pinning urllib3 seemed like
a safer fix.
feat(docker registry): add Vagrantfile for Docker registry

Adds a contrib/docker-registry directory with a Vagrantfile that
configures and starts a VM with the Docker registry service.
Merge pull request #1117 from deis/fix-readthedox

fix(readthedocs): install CLI requirements explicitly
feat(contrib) Spin up an ELB

Fixes #1139
Use TCP > HTTP
fix(controller): disable web UI

fixes #1144
fix(controller) disable django admin URL

If you accidentally create an object that requires an external library
such as the Release object, no docker image will be pushed to the registry,
which is unintentional. This disables the django admin URL such that you can't
shoot yourself in the :shoe:.