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