Sketch of implementation.
Add mountpoint to sketch.
Merge remote-tracking branch 'refs/remotes/origin/master' into orchestration-exposes-data-to-containers-311
Create test utilities module for flocker.volume.
VolumeService.get(), a minimal API to prevent abstraction breakage.
Applications with volumes have the volume exposed to Docker before being started.
Stopped applications have their volume (if any) removed from Docker.
Lint fixes.
Merge remote-tracking branch 'refs/remotes/origin/master' into orchestration-exposes-data-to-containers-311

Conflicts:
	flocker/node/test/test_deploy.py
Fix another import.
Lint fix.
Merge remote-tracking branch 'refs/remotes/origin/master' into orchestration-exposes-data-to-containers-311

Conflicts:
	flocker/node/test/test_script.py
Merge pull request #355 from ClusterHQ/orchestration-exposes-data-to-containers-311

Orchestration exposes data to containers.

Fixes #311.