WIP: Implementing create container workflow

Wondering how to set the container type select element to 'lxc' as part of the test. See `test_machine_view_panel.js`, line 389, https://github.com/juju/juju-gui/pull/393/files#diff-083887946d0a35f6814ae62499ba4829R389 - the value of this select is passed as data in the `createMachine` event that gets fired at https://github.com/juju/juju-gui/pull/393/files#diff-da19dde1a956e91d68a94d9aecf29368R80
As discussed, you're going to be changing this to use the e.newVal value. But this won't help with line 80 above. I think that the best way to do this to avoid having to touch the DOM again in line 80 is to set an attribute on this view with the container type when it changes.