Add third_party/etcd to .gitignore

Otherwise the tree looks "dirty" after hack/install-etcd.sh is executed.

Tested:
- Ran `git status` after running `hack/install-etcd.sh`.

Signed-off-by: Filipe Brandenburger <filbranden@google.com>
Revisit identifiers spec
Simplify pod namespaces
Make pods a case study in identifiers.md
Document auto-set names
kubelet: move docker-related code into sub-package
Add vagrant user to docker group
Add new dependencies for AWS support

- goamz: for interacting with AWS API
- gcfg: for cloud provider config file (as suggested in issue)
Initial impl. of cloud provider interface for AWS
Re-add namespaces
Fix the logrotate cron job.
kubelet: generate keyring from .dockercfg
Merge pull request #1218 from bcwaldon/docker-auth

Authenticated docker pulls, pt. I
Merge pull request #1291 from brendandburns/logs

Fix the logrotate cron job.
FEATURE: Support privileged containers in a pod

Add a Privileged field to containers in a pod, in order to facilitate pods
performing administrative tasks such as builds via Docker-in-Docker.

Discussion: https://github.com/GoogleCloudPlatform/kubernetes/issues/391
Add a global flag to enable/disable privileged containers
Merge pull request #1288 from brendandburns/privilege

Add support for privileged containers.
Remove unused enable_cors flag and allow localhost without a port as an origin in local-up-cluster
Merge pull request #1243 from filbranden/gitignore_thirdparty_etcd1

Add third_party/etcd to .gitignore
Merge pull request #1298 from jwforres/cors_fixup

Remove unused enable_cors flag and allow localhost without a port as an ...