Disable the deploy button if there are no changes.
Set version for release.
Set version back to unreleased.
Merge pull request #383 from huwshimi/deploy-button-disabling

Disable the deploy button if there are no changes.

The deploy button should be disabled when there is nothing to deploy.

QA:
- load the gui with the mv flag
- check that the deploy button is grey and that clicking on it does nothing
- drag a charm to the canvas
- the deploy button should be orange and clicking on it should open the summary panel
Show the list of recent changes on the deploy summary panel.
Add notes on attempting to land again.

- Also removed the old instructions. I think we've got the new system in place
long enough.
Merge pull request #387 from mitechie/update-ci-docs

Add notes on attempting to land again.

- Also removed the old instructions. I think we've got the new system in place
long enough.
Merge pull request #386 from huwshimi/summary-recent-changes

Show the list of recent changes on the deploy summary panel

This shows the list of recent changes on the deploy summary panel.

QA:
- drag a charm to the canvas
- click deploy in the deployer bar
- click "View the complete change log"
- the change log should appear