Added local-new-upgrade inspector.
Linter-errors fixed.
Responding to reviews: tests accurately check for rendered views; docstrings
Merge pull request #181 from makyo/upgrade-inspector

To QA:

1. Drag a local charm onto the canvas and deploy.
2. Repeat the process with the same charm, ensure that the upgrade and request series views are displayed in the inspector.
3. Check on a real env if possible.