Jetpack Monitor: Add the ability to each user to set individually if they want to receive monitor notifications.

+ Configurable at the Monitor configuration page.
Jetpack Monitor: Show the email address that receives the monitor notifications.
Jetpack Monitor: Add the option to activate/deactivate the monitor from the monitor configuration page.
Jetpack Monitor: Send notifications to the administrator that activates the module.

+Remove restriction that allowed only the connection owner to activate the monitor.
Jetpack Monitor: Remove option to activate/deactivate the monitor on the configuration page.
+ it doesn't make sense to duplicate the functionality of activating/deactivating the module.
Jetpack Monitor: Deactivate the module if the monitor is not active.
Merge branch 'monitor-multiple-users'