fix(client): clear cookies on login, logout, register

We should be clearing all cookies, since we can only be logged into
a single user and cluster at the same time. This fixes the 403 Forbidden
when being logged in immediately after registering.
fix(Dockerfile): ensure `apt-get install` is prefixed by `update`

Since Dockerfile layers are cached, having `apt-get update` as a separate
command creates the potential for a subsequent `apt-get install` to fail.
Best practices (other than "install from source") seem to be to make
both commands into a one-liner.

This PR ensures we don't `apt-get install` as its own command anywhere,
removes the installation of some packages that were already in deis/base,
and removes a redundant ENV DEBIAN_FRONTEND statement.
Merge pull request #1249 from deis/dockerfile-apt-get-fix

fix(Dockerfile): ensure `apt-get install` is prefixed by `update`
fix(confd): services check for valid config before reloading
Merge pull request #1112 from deis/check-configs

fix(confd): services check for valid config before reloading
chore(controller): update Django to 1.6.5 security release

https://www.djangoproject.com/weblog/2014/may/14/security-releases-issued/
chore(controller): update South to 1.0 final release

http://south.readthedocs.org/en/latest/releasenotes/1.0.html
Merge pull request #1248 from deis/update-django-and-south

chore(controller): update django and south
fix(controller): ignore KeyError when purging user from etcd
Merge pull request #1332 from deis/fix-auth-cancel

fix(controller): ignore KeyError when purging user from etcd
documentation(README): add note about ram usage and Ubuntu

These fixes are to document some of the vices that have plagued me as I
was getting up to speed with Deis and its Vagrant workflow inside Ubuntu.
Merge pull request #1343 from Xe/documentation/virtualbox-in-ubuntu

documentation(README): add note about ram usage and Ubuntu
docs(README): fix ram to RAM
Merge pull request #1136 from deis/clear_cookies

fix(client): clear cookies on login, logout, register
fix(router): bump read timeout to 10min for docker build
feat(client): add deis build support
feat(controller): add deis build support
feat(builder): add deis build support
fix(router): update send_timeout from rebase error
chore(registry): bump version to repository-import

The endpoint introduced in this branch is important as it allows registry-to-registry
repository transfers. This is required to speed up the `deis build` process and to remove
the docker engine from the controller.