Add new API call to get all the autoscalers currently managed by
orbiter:
```
curl http://localhost:8000/autoscaler
```
Add command into the CLI to get this list
```
export ORBITER_HOST=http://localhost:8000 orbiter autoscler ls
```
Add command into the CLI to print all the events fired by the daemon:
```
export ORBITER_HOST=http://localhost:8000 orbiter system events
```
Fixed#9
This PR bootstrap the autodetection feature:
1. It works when the configuration file is not setup. Right know I am
not going to manage the merge of double sources (autodetection and
configuration file).
2. At the moment only Docker Swarm will support this feature.
