Add a predicate for persistent disk scheduling.
Create MinionController to sync minions from cloudprovider (pkg cloudprovider/controller).
Remove OnceAndForever util, create a Run() method on MinionController.
Use Forbidden valdiation error when no capability
Make watching error logging message less severe since it is expected.

Fix #1653
Add an e2e test in go. Also adjust validation logic a little to make it more reasonable.
Not integrated into existing e2e yet.
Rev the version to 0.4
Add 0.4-dev commit
Merge pull request #1793 from dchen1107/cleanup

Make watching error logging message less severe since it is expected.
Add initial changelog
Merge pull request #1786 from dchen1107/release

Release 0.4
Add skeleton for new OpenStack cloud provider
Add github.com/rackspace/gophercloud package as a dependency.

Note this also pulls in:
github.com/kr/text
github.com/mitchellh/mapstructure
github.com/racker/perigee
github.com/tonnerre/golang-pretty
Read user/pass from config and authenticate to OpenStack
Implement Instances interface for OpenStack cloud provider
Supply command line args to td-agent
Updating docker client to the latest version in preparation for adding native docker exec support.
Move developer documentation to docs/devel/

Fix links.
Merge pull request #1715 from ddysher/cloud-minion

Add external loop to sync minions from cloudprovider.
Merge pull request #1791 from erictune/new_validation_err

Use Forbidden valdiation error when no capability