Removed "monit | " from tasks and handlers.

Since a couple of versions ago, ansible prints the role name when
executing in the context of a playbook. As such, the "monit | "
in a task and handler name is redudant.
Added apache service. TODO: paramatrize it.
Added apache template.

templates/monitors/apache.j2:
- Rules are loaded from monit_apache_rules variable if present;
- Groups are loaded from monit_apache_groups variable if present.

defaults/main.yml:
- added default values for apache template.
Added a description for apache variables.