Consolidate summary generation.
Changed deployer health bar height.
Merge pull request #398 from huwshimi/generate-changeset

Consolidate summary generation

Instead of looping through the changes a number of times to generate the summary this branch merges the functions into one.

QA: There are no visual changes in this branch, the summaries should be generated as before.
Merge pull request #399 from huwshimi/inspector-health-bar-height

Changed deployer health bar height

OK, here goes, I'd set aside a morning for this review.

QA:
- drag a service to the canvas
- click deploy and confirm
- click on the service block
- in the inspector check that the health bar is 10px high
Implement the create container workflow.

No matter how the user enters the workflow, they should end up seeing
the form to select a container type and (optionally) constraints.
Review feedback.