Make individual controller actions asynchronous.
Extend validation for ReplicationController

Provide type safe checks for empty sets of selectors.
named container ports should have sane env var names
Solve issue with realpath on Mac OS X.

* realpath doesn't work on Mac OS systems. I found the following
  workaround that should work in any distro. For more references see the
  following: http://serverfault.com/questions/40144/how-can-i-retrieve-the-absolute-filename-in-a-shell-script-on-mac-os-x
Add master.Config type and cleanup master configuration

Setting up a new master.Master instance requires passing
around too many arguments.

Add a master.Config type and group related master configs.
Refactor all commands to instantiate new masters using a
master.Config struct.
kubecfg: improve tests around authentication

This change adds additional test coverage for the kubecfg
command. There is now a test for the case when the auth info
file does not exist. LoadAuthInfo tests have been refactored
to use table testing.
Add a sanity check for running etcd servers to the integration test script.
health: Improve test coverage
Use http.StatusInternalServerError instead of 500
Allow API_PORT to be changed via hack/local-up
Fix typo in README
volume: improve test coverage and minor refactoring

The volume package does not test enough use-cases.

Improve test coverage by adding additional tests and refactoring
current tests to use table testing.

This change introduces a new error var to make testing unsupported
volume type errors easier.

This change does not introduce any changes in behavior.
Remove extra test flags from all commands

Currently all commands are being build with extra flags. The extra
flags appear because of a direct import of the testing package from
the fake_etcd_client.go source file.

Remove the direct import of the testing package. Add a tools.T
interface to support existing behavior. Also clean up two TODO items
by remove using of the expectError and expectNoError functions.

Fixes #579
Add go fuzzer in preparation for testing. Also gofmt a few files that needed it.
Merge pull request #652 from kelseyhightower/fix_readme_typo

Fix typo in README
Merge pull request #650 from smarterclayton/use_constant_code

Use http.StatusInternalServerError instead of 500
Merge pull request #645 from brendandburns/integration

Add a sanity check for existing etcd servers to the integration test script
Update Service and ReplControllers to validate

Validations are performed on update and on create.
Use 'go install' to build all commands at the same time.

'go build' compiles the packages but discards the results if multiple packages specified.
Add TODOs, clean up, clarify comments, and add one more test.