Add a "no services" message.
Update service count in charmbrowser.
Lint cleanup.
Merge pull request #618 from kadams54/added-services-touchup

Added services touchup

Added the following touchups:

* "No services" message
* Added services nav button in the charmbrowser now updates its service count properly
Show a link to the MAAS server.

When the provider is MAAS, display a link
to the MAAS management interface in the
header.

Also implemented the EnvironmentGet call
in sandbox mode.