feat(*): Scalable registry

Allow the deis registry to be scaled across multiple cluster nodes
feat(database): disable copy on write to improve performance
docs(schedule): add release schedule & planning documentation
chore(registry): Upgraded registry to 0.9
fix(*): Handling of unavailable services

Send 503 - Service Temporarily Unavailable for not running services

Fixes #2161
chore(release): bump version to v1.1.0-dev
chore(release): update release version in master to v1.0.2
Merge pull request #2587 from mboersma/release-1.0.2

chore(release): update release version in master to v1.0.2
Merge pull request #2586 from bacongobbler/v1.1.0-dev

chore(release): bump version to v1.1.0-dev
chore(README): update release version in master to v1.0.2
docs(managing_deis): always upgrade CoreOS hosts in serial
Merge pull request #2589 from carmstrong/docs-upgrade_coreos_in_serial

docs(managing_deis): always upgrade CoreOS hosts in serial
feat(controller): check client against API version

Before locking the API version, we needed some way to ensure that
we did not break the client. This was done by comparing the client's
version against the server. If there was a mismatch on the minor or
major release versions (as noted in Semver 2.0.0[1]), the server
would refuse the request. Because we have locked the API version,
it would make sense to test against that to see if the client is
compatible with the API. If not, then the client should upgrade.

This also modifies the current behaviour to warn the user on a minor
version mismatch. If there is a minor version mismatch between the
client and the server, it will press onwards and display a warning,
advising the user to upgrade. If there is a major version mismatch,
then the API server will refuse the request as before.

[1]: http://semver.org/
Merge pull request #2535 from mboersma/release-schedule-docs

docs(schedule): add release schedule & planning documentation
fix(router/Makefile): use pwd since "docker cp" no longer allows "."

This fixes the problem when doing "make build" using Docker 1.3.2.
feat(controller): add X_DEIS_PLATFORM_VERSION header in response
chore(release): bump controller API to v1.1
Merge pull request #2443 from johanneswuerbach/no-service

fix(*): Handling of unavailable services
feat(CONTRIBUTING): add design proposal guidelines

ripped straight from https://github.com/docker/docker/blob/master/CONTRIBUTING.md#design-and-cleanup-proposals
chore(Makefile): update development registry image to v0.9.0 tag