Support common shared options for monitors

[ojongerius]

The following options have yet to be implemented:

        silenced dictionary of scopes to timestamps or None. Each scope will be muted until the given POSIX timestamp or forever if the value is None.
            Default: None

            Examples:

            To mute the alert completely:
            {'*': None}

            To mute role:db for a short time:
            {'role:db': 1412798116}

            timeout_h the number of hours of the monitor not reporting data before it will automatically resolve from a triggered state.
                Default: None

            escalation_message a message to include with a re-notification. Supports the '@username' notification we allow elsewhere. Not applicable if renotify_interval is None.
                Default: None

            notify_audit a boolean indicating whether tagged users will be notified on changes to this monitor.
                Default: False

            include_tags a boolean indicating whether notifications from this monitor will automatically insert its triggering tags into the title.
                Default: True

                Examples:

                True:
                [Triggered on {host:h1}] Monitor Title

                False:
                [Triggered] Monitor Title

[ojongerius]

Support has been added to generic monitor.