First version of the monitoring API

Add the routes:
- /entries/<name>/stats
- /entries/<name>/status
- /entries/<name>/start
- /entries/<name>/stop
- /entries/<name>/restart
Fix typo in API (stats -> status)
Use PUT for actions in the API
GET -> PUT for actions in API implementation
Merge pull request #67 from onitu/monitoring

First version of the monitoring API. Fix #50