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
Proposed ContainerStatus for each individual Container in a Pod.
Introduce ContainerStates. Currently keep it has the same set as PodStatus:
Waiting, Running, Termination. For each state, there are some meaningful
status associated with it.
Clean up
Fix the e2e scripts after PR 1284 which added a new file.
Merge pull request #1286 from brendandburns/fix

Fix the e2e scripts after PR 1284 which added a new file.
Start log rolling for docker containers too. Fix logrotate for other daemons.
Merge pull request #1287 from brendandburns/logs

Start log rolling for docker containers too. Fix logrotate for other daemons.
Add a pointer to running on open stack docs.
typo
Merge pull request #1268 from dchen1107/termination

Proposed ContainerStatus for each individual Container in a Pod.
Re-add namespaces