Make individual controller actions asynchronous.
Extend validation for ReplicationController

Provide type safe checks for empty sets of selectors.
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.
health: Improve test coverage
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.
Update Service and ReplControllers to validate

Validations are performed on update and on create.
Remove cmd/integration from hack/build-go.sh

Covered by hack/integration-test.sh in travis
Stopy proxying etcd (localhost:4001) on https:/$MASTER_IP/etcd.
Travis should test that build-go.sh generated something

Add a new hack/test-cmd.sh that tries to use the generated
executables in a meaningful way.  It does not require Docker
so as to be runnable in Travis
Merge pull request #642 from kelseyhightower/cleanup_master_configs

Add master.Config type and cleanup master configuration
Disable early error exit, since the salt script is broken for now.
See: https://github.com/saltstack/salt-bootstrap/pull/436
Merge pull request #667 from brendandburns/debian

Disable early error exit, since the salt script is broken for now.
Move CONTRIB{,UTING}.md so GitHub shows it

Leave an old anchor
Merge pull request #648 from kelseyhightower/improve_health_test_coverage

health: Improve test coverage
Merge pull request #668 from smarterclayton/move_contributing

Move CONTRIB{,UTING}.md so GitHub shows it
Merge pull request #666 from erictune/remove_etcd_proxying

Stopy proxying etcd (localhost:4001) on https:/$MASTER_IP/etcd.
Merge pull request #640 from rafael/fix-realpath-issue-on-mac

Solve issue with realpath on Mac OS X.
Merge pull request #623 from smarterclayton/validate_replication_controllers

Add validation to ReplicationControllers
Merge pull request #655 from smarterclayton/verify_travis_builds

Travis should test that build-go.sh generated something