Upgrade to node-convict

Removes the YAML parsing library which had security vulnerabilities. No
breaking changes should result from this release.

This introduces a breaking change, where empty values in your
configuration.yaml file are no longer allowed. As such the docker
connection host and port should only be added where required.

For more details see #46 and #47

Introduces a new pause and unpause command

Allows linked containers to be controlled correctly by their name
Various bug fixes

Bug fix for stopped containers not being returned unless a limit is s…

…pecified

Fix for incorrect containers being returned

Bump version for security fixes

Bump version

Include latest bug fix for right image name

Push Raspberry Pi images

Bump version

Merge pull request #9 from philhawthorne/dev

Introduce new start, stop and container GET endpoints