Implement the environmentGet API endpoint.

Also call it to retrieve the MAAS server address when in MAAS.
Fix typo and improve tests isolation.
Fade/hide units/machines in machine view on command.
Merge pull request #611 from frankban/retrieve-maas-server

Implement the environmentGet API endpoint.

Also call it to retrieve the MAAS server address when in MAAS.
Change the sidebar background to white.
First pass at removing the old pyjuju code and its dependencies.
Fixed typo when removing modules
Fixed spurious test failure
Tests added for new events.
Review and QA feedback.
Merge pull request #613 from kadams54/added-services-bg

Change the sidebar background to white.
Merge pull request #612 from hatched/remove-pyjuju

First pass at removing the old pyjuju code and its dependencies.
Add attr docs.
Merge pull request #615 from makyo/fade-highlight-machines

Fade/highlight units/machines in machine view.