fix javascript naming (icinga-url to icingaurl), fix add form, add remove button, code style changes refs #4192
Add the downtime overview view, add the downtimes controller action, fix issues with the the DowntimeQuery and add the new fields to the DowntimeView. Fix issues in the ShowController that occur due to the changes in the DowntimeQuery. refs #4188
Add new configuration controller for the configuration controllers later. refs #4299
refs #4212