Added thew new local charm upgrade or new inspector instance with
base viewlet view class and templates.
fixed css issue causing the header styling to not be portable to new viewlet Y.Views instances
Added a test and linting for the showUpgradeOrNewInspector method
Merge pull request #145 from hatched/upgrade-or-new-inspector

__Notes__
This is a partially incomplete branch. To continue I need to convert a viewlet to view which is out of scope of this branch so I am landing this in the interm.

__To QA __
- Deploy a local charm
- Try and deploy the same one, a small black box should appear with the text "Local Charm Upgrade"