Add support to placeUnit for placing a unit on an already existing machine
Added tests for placeUnit functionality in the ecs
Don't show ghost inspector deploy button with the deployer bar.
Merge pull request #334 from hatched/unplaced-to-existing

1. Fixes a bug with `ecs.placeUnit` which would cause dropping an unplaced unit on an existing container to fail.
2. Adds tests for `ecs.placeUnit`.

#### To QA
- Open `config-debug.js` and disable `simulateEvents`.
- Open `app.js` and add `this.fakebackend = state` after line 418
- Load the GUI using the mv and il flags.
- Drag and drop a charm to the canvas. 
- Switch to the machine view.
- Drag and drop the unplaced unit to the `New Machine` header.
- Click `deploy` and `confirm`.
- Switch back to the service view.
- Run `app.db.machines.add({id: '0/lxc/0'}); app.fakebackend.db.machines.add({id: '0/lxc/0'})` in the console.
- Drag and drop a new charm to the canvas.
- Switch to the machine view.
- Select the `0` machine. You should now see an empty container and 'Bare Metal' with your previous service.
- Drag the unplaced unit and drop it on the empty container.
- Click `deploy` and `confirm`.
- Switch to service view and back to machine view. You should now have placed your new service on that container.
Merge pull request #336 from huwshimi/il-controls

This branch hides the ghost inspector deploy controls when the deployer bar is visible.

There is also drive-by to remove some CSS and a template that are no longer being used.

QA:
With no flags:
- Drag a service to the canvas.
- Check that the 'Cancel' and 'Deploy' buttons **are** visible in the inspector.

With mv flag:
- Drag a service to the canvas.
- Click on the service (the inspector should open).
- Check that the 'Cancel' and 'Deploy' buttons are **not** visible.